US20160064018A1 - Write head with coil structure aligned with yoke - Google Patents
Write head with coil structure aligned with yoke Download PDFInfo
- Publication number
- US20160064018A1 US20160064018A1 US14/798,998 US201514798998A US2016064018A1 US 20160064018 A1 US20160064018 A1 US 20160064018A1 US 201514798998 A US201514798998 A US 201514798998A US 2016064018 A1 US2016064018 A1 US 2016064018A1
- Authority
- US
- United States
- Prior art keywords
- yoke
- main pole
- tip
- abs
- coil structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 230000004907 flux Effects 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910002546 FeCo Inorganic materials 0.000 description 2
- -1 but not limited to Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910019236 CoFeB Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 229910005435 FeTaN Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- QVYYOKWPCQYKEY-UHFFFAOYSA-N [Fe].[Co] Chemical compound [Fe].[Co] QVYYOKWPCQYKEY-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- XBCSKPOWJATIFC-UHFFFAOYSA-N cobalt iron nickel Chemical compound [Fe][Ni][Fe][Co] XBCSKPOWJATIFC-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/17—Construction or disposition of windings
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/312—Details for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles
- G11B5/3123—Details for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles by using special coil configurations or conductors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6082—Design of the air bearing surface
Definitions
- a disc drive is an example of a data storage system that uses magnetic fields for writing and reading data.
- Transducers write information to and read information from data surfaces of the discs.
- transducers include a recording or write head for generating a magnetic field that aligns the magnetic moments of a magnetic medium to represent desired bits of data.
- Magnetic recording heads include both longitudinal and perpendicular recording techniques.
- Perpendicular recording is a form of magnetic recording in which magnetic moments representing bits of data are oriented perpendicularly to the surface of the recording layer.
- Perpendicular magnetic write heads typically include main and return poles that are separated to form a write gap and extend from pole tips located at an air-bearing surface (ABS) to a back gap region.
- a coil is included to generate magnetic signals through the main and return poles in response to a current conducted through the coil. The main pole tip focuses the magnetic flux density such that the magnetic fields interact with the magnetic medium to orient its magnetic moments in an up or down direction.
- Implementations described and claimed herein provide a write head comprising a write pole, a yoke, and a coil structure helically wound around the write pole and the yoke, the coil structure having the first turn of the coil structure aligned with the tip of the yoke.
- One particular implementation is a write head having a main pole, a trailing yoke having a yoke tip; and a coil structure around the main pole and the yoke.
- the coil structure has a first turn with its front edge at least substantially aligned with the yoke tip.
- Another particular implementation is write head having a main pole having a pole tip proximate an air bearing surface (ABS), with the main pole having a leading side and a trailing side.
- the write head also includes a leading yoke having a leading yoke tip recessed from the ABS and a trailing yoke having a trailing yoke tip recessed from the ABS.
- a coil structure is present around the main pole and the yokes.
- the coil structure has a first turn on the leading side with its front edge at least substantially aligned with the leading yoke tip, and also has a first turn on the trailing side with its front edge at least substantially aligned with the trailing yoke tip.
- a disc drive comprising at least one magnetic storage disc, and a transducer head comprising a read head and a write head.
- the write head has a main pole, a trailing yoke having a yoke tip, and a coil structure around the main pole and the yoke, the coil structure having a first turn with its front edge at least substantially aligned with the yoke tip.
- FIG. 1 is a schematic top view of storage device having an example write head implemented on an end of an actuator assembly.
- FIG. 2 is a schematic cross-sectional partial side view of an example write head.
- FIG. 3 is a schematic cross-sectional partial side view of another example write head.
- FIG. 4 is a schematic cross-sectional partial side view of yet another example write head.
- FIG. 5 is a schematic cross-sectional partial side view of yet another example write head.
- FIG. 6 is a schematic cross-sectional partial side view of yet another example write head.
- FIG. 7 is a schematic cross-sectional partial side view of yet another example write head.
- the write head ‘writes’ information into the recording media by switching the writer's magnetic field from one polarity to the other through a driving current waveform change.
- HDR high data rate
- the switching speed increases.
- the write field magnitude will be degraded and magnitude variation will be enlarged with data rate increase. These not only cause poorer media saturation, but also cause worse transition sharpness between bits.
- write field bubble expansion is slower at the track edge than in the track center, the transition curvature along the cross-track direction will become larger as the data rate increases.
- the basic requirements for writer design for high areal density recording include providing strong writeability, confining the field in the down-track and cross-track directions, and reducing the erase field.
- reducing the trailing edge physical width of the write pole tip directly helps reduce track pitch.
- reducing write pole width could cause larger track inflation and increase of the adjacent track fringing field.
- the large adjacent track fringing field will degrade the write field cross-track gradient and worsen the track edge erase band. This in turn will limit the track density push.
- the present disclosure provides writer designs, or write head designs, that can significantly increase the write speed (e.g., faster switching) and improve driving current-write field efficiency, thus benefiting HDR performance.
- the write designs have a shorter magnetic field rise time while decreasing the coil power needed to achieve the magnetic field. The lower coil power will correspond to lower erasure field, benefiting writer's reliability
- An implementation of a recording head disclosed herein includes a coil structure having its first turn at least substantially aligned with the end or tip of the trailing side or top yoke.
- the alignment of the coil structure with the yoke tip increases the switching speed of the write head and decreases the power usage, both which improve high data rate performance.
- the difference in distance between the coil to the ABS and the yoke tip to the ABS is no more than 10 nm. In other implementations, the difference in distance between the coil to the ABS and the yoke tip to the ABS is no more than 20 nm, or 50 nm. In some implementations, a difference in distance between the coil to the ABS and the yoke tip and the ABS is no more than 100 nm.
- the offset or difference in distance is no more than 20% of the diameter of the wind or turn of the coil. In other implementations, the offset or difference in distance is no more than 10% or even no more than 5% of the distance between the coil to the ABS, and in yet other implementations the offset or difference in distance is no more than 10% or even no more than 5% of the distance between the yoke tip to the ABS.
- a reference numeral may have an associated sub-label consisting of a lower-case letter to denote one of multiple similar components.
- the reference is intended to refer to all such multiple similar components.
- FIG. 1 illustrates a storage device 100 having an example recording head structure implemented on an end of an actuator assembly.
- FIG. 1 illustrates a top plan view of an implementation of a magnetic media or disc 102 with a transducer head 104 situated on an end of an actuator assembly 106 .
- Disc 102 rotates about a disc axis of rotation 108 during operation in the direction indicated.
- disc 102 includes an outer diameter 110 and inner diameter 112 between which are a number of data tracks 114 , illustrated by dotted lines.
- Data tracks 114 are substantially circular and are made up of regularly spaced patterned bits.
- Transducer head 104 mounted on actuator assembly 106 at an end distal from the actuator axis of rotation 116 , flies in close proximity above the surface of disc 102 during disc operation.
- Transducer head 104 includes a recording head including a read pole for reading data from track 114 and a write pole for writing data to track 114 .
- FIG. 1 also illustrates an expanded view of a partial cross-sectional configuration of transducer head 104 , particularly, of a write head portion 120 of transducer head 104 .
- Write head 120 is illustrated with its air bearing surface (ABS) 122 near magnetic media or disc 102 .
- ABS air bearing surface
- write head 120 includes a main pole 124 (also referred to as the write pole) configured to write data to disc 102 by a magnetic field.
- Main pole 124 is made of a ferromagnetic material such as, but not limited to, iron (Fe), cobalt (Co), nickel (Ni), and combinations thereof.
- main pole 124 can comprise an alloy such as, but not limited to, iron and cobalt (FeCo), iron and nickel (FeNi), cobalt, iron and nickel (CoFeNi), iron and aluminum nitride (FeAlN), iron and tantalum nitride (FeTaN), cobalt, iron and boron (CoFeB), cobalt and iron nitride (CoFeN), and the like.
- FeCo iron and cobalt
- FeCo iron and nickel
- CoFeNi cobalt
- CoFeNi iron and aluminum nitride
- FeAlN iron and tantalum nitride
- CoFeB cobalt and iron nitride
- CoFeN cobalt and iron nitride
- Write head 120 also includes a yoke 126 , which facilitates switching of the magnetic flux from main pole 124 .
- a yoke tip 127 is recessed from the ABS 122 and from the tip of main pole 124 .
- Yoke 126 and its yoke tip 127 are made of a high magnetic moment material, such as iron cobalt (FeCo), cobalt iron nickel (CoFeNi), and the like.
- Coil structure 128 present around main pole 124 and yoke 126 with a plurality of turns.
- Coil structure 128 may be a helical coil wrapped around main pole 124 and yoke 126 , or coil structure 128 may be composed of planar coils present on each side of main pole 124 and yoke 126 .
- Coil structure 128 is made of an electrically conductive material such as, but not limited to, copper (Cu), silver (Ag), gold (Au), and combinations thereof.
- Coil structure 128 generates a magnetic field to rotate the magnetization in yoke 126 and main pole 124 from behind ABS 122 ; the rotation or switching happens when a magnetic domain wall propagates to the ABS 122 .
- Coil structure 128 is positioned so that it is at least substantially aligned with yoke tip 127 .
- yoke tip 127 and the front edge of coil structure 128 are substantially the same distance from the ABS 122 .
- the difference in distance between coil structure 128 to the ABS 122 and yoke tip 127 and the ABS 122 is no more than 10 nm.
- the difference in distance between coil structure 128 to the ABS 122 and yoke tip 127 and the ABS 122 is no more than 20 nm, or 50 nm.
- a difference in distance between coil structure 128 to the ABS 122 and yoke tip 127 and the ABS 122 is no more than 100 nm.
- the offset or difference in distance is no more than 20% of the diameter of the wind of coil structure 128 . In other implementations, the offset or difference in distance is no more than 10% or even no more than 5% of the distance between coil structure 128 to the ABS 122 , and in yet other implementations the offset or difference in distance is no more than 10% or even no more than 5% of the distance between yoke tip 127 to the ABS 122 .
- Example distances from ABS 122 to yoke tip 127 and/coil structure 128 include distances between 1 and 2 micrometers, such as 1.2 micrometers, 1.3 micrometers, 1.5 micrometers, and 1.8 micrometers.
- Such a write head design having the first coil turn of the coil structure at least substantially aligned with the yoke tip, improves the efficiency of the coil structure by positioning the yoke(s) so that it receives optimum magnetic flux from the active turns, thus improving high data rate performance and efficiency.
- the configuration provides an efficient writer, reducing both magnetic rise time (i.e., the time to fully reverse saturate a pole) and amplitude of current needed to saturate the pole tip, as well as reducing erasure flux.
- a magnetic flux in the pole propagates to the ABS 122 from coil structure 128 and main pole 124 . The longer the travelling distance for the magnetic flux, the slower the switching of the magnetic orientation.
- FIG. 2 illustrates a write head 200 having an air bearing surface (ABS) 222 , a main pole 224 (also referred to as the write pole) defining a leading edge side 223 and a trailing edge side 225 ; leading edge side 223 engages the disc prior to main pole 224 engaging the disc as it spins, and trailing edge side 225 engages the disc after main pole 124 engages the disc as it spins.
- Main pole 224 has a pole tip 226 proximate the ABS 222 .
- On trailing edge side 225 of main pole 224 is a yoke 236 having a yoke tip 237 recessed from pole tip 226 .
- a coil structure 228 is present around main pole 224 and yoke 236 as a plurality of turns 238 .
- Write head 200 has a first return pole (RP 1 ) 230 on leading edge side 223 of pole 224 and a second return pole (RP 2 ) 232 on trailing edge side 225 of pole 224 .
- RP 2 232 includes a front shield 234 extending towards main pole 224 at the ABS 222 ; front shield 234 may be integral with RP 2 232 or may be a separate element, either or the same or different material than RP 2 232 .
- a first back via 243 connects main pole 224 to RP 1 230 by way of yoke 236 and a second back via 245 connects main pole 224 to RP 2 232 .
- Coil structure 228 extends between main pole 224 and RP 1 230 and between main pole 224 /yoke 236 and RP 2 232 .
- Coil structure 228 may be a helical coil wrapped around main pole 224 and yoke 236 , or coil structure 228 may be composed of planar coils present on leading edge side 223 of main pole 224 and on trailing edge side 225 of yoke 236 .
- coil structure 228 has three turns 238 on each side of main pole 224 and yoke 236 . Each turn 238 of coil structure 228 is connected in series with the other turns 238 of coil structure 228 , at least on that side of main pole 224 .
- coil structure 228 can comprise a plurality of coils (e.g., three coils) each forming separate electric circuits.
- a dielectric or insulating material (not shown), such as alumina (Al 2 O 3 ), electrically insulates coil structure 228 from main pole 224 and RP 1 230 and from main pole 224 /yoke 236 and RP 2 232 .
- a front edge 239 of first turn 238 of coil structure 228 (i.e., the turn closest to the ABS 222 ) is at least substantially aligned with yoke tip 237 ; that is, the distance from edge 239 of first turn 238 to the ABS 222 is at least substantially the same as the distance from yoke tip 237 to the ABS 222 .
- the difference in distance between edge 239 of first turn 238 to the ABS 222 and yoke tip 227 to the ABS 222 is no more than 1 nm. In other implementations, the difference in distance between edge 239 to the ABS 122 and yoke tip 227 to the ABS 222 is no more than 2 nm.
- FIG. 3 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements of FIG. 3 are the same as or similar to like elements of FIG. 2 .
- a write head 300 has an air bearing surface (ABS) 322 , a main pole 324 having a pole tip 326 proximate the ABS 222 , and a yoke 336 having a yoke tip 337 recessed from pole tip 326 .
- a coil structure 328 is present around main pole 324 and yoke 336 as a plurality of turns 338 .
- Write head 300 has a first return pole (RP 1 ) 330 and a second return pole (RP 2 ) 332 on the opposite side of pole 324 .
- RP 2 332 includes a front shield 334 extending towards main pole 324 at the ABS 322 .
- a first back via 343 connects main pole 324 to RP 1 330 by way of yoke 336 and a second back via 345 connects main pole 324 to RP 2 332 .
- Coil structure 328 wraps between main pole 324 and RP 1 330 and between main pole 324 /yoke 336 and RP 2 332 .
- coil structure 328 has two turns 338 on each side of main pole 324 and yoke 336 .
- Each turn 338 of coil structure 328 is connected in series with the other turns 338 of coil structure 328 , however, any suitable configuration of coil structure 328 can be utilized.
- a dielectric or insulating material (not shown), such as alumina (Al 2 O 3 ), electrically insulates coil structure 328 from main pole 324 and RP 1 330 and from main pole 324 and RP 2 332 .
- An edge 339 of the first turn 338 of coil structure 328 (i.e., the turn closest to the ABS 322 ) is at least substantially aligned with yoke tip 337 .
- FIG. 4 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements of FIG. 4 are the same as or similar to like elements of FIG. 2 and FIG. 3 , whether called out or not.
- a write head 400 has an air bearing surface (ABS) 422 and a main pole 424 defining a leading edge side 423 and a trailing edge side 425 .
- Main pole 424 has a pole tip 426 proximate the ABS 422 .
- On leading edge side 423 of main pole 424 is a leading yoke 436 a having a yoke tip 437 a recessed from pole tip 426
- On trailing edge side 425 is a trailing yoke 436 b having a yoke tip 437 b recessed from pole tip 426 .
- Leading yoke 436 a may alternately or additionally be referred to as a “bottom yoke” and trailing yoke 426 b may alternately or additionally be referred to as a “top yoke.”
- yoke tip 437 a on leading side edge 423 is not even or aligned with yoke tip 437 b on trailing side edge 425 .
- a coil structure 428 is present around main pole 424 and yokes 436 as a plurality of turns 438 .
- Turns 438 a are located on leading edge side 423 proximate yoke 436 a and turns 438 b are located on trailing edge side 425 proximate yoke 436 b.
- Write head 400 has a first return pole (RP 1 ) 430 (that includes a front shield, not called out) and a second return pole (RP 2 ) 432 on the opposite side of pole 424 .
- a first back via 443 connects main pole 424 to RP 1 430 by way of yoke 436 a and a second back via 445 connects main pole 424 to RP 2 432 by way of yoke 436 b.
- Coil structure 428 in this implementation, has two turns 438 on each side of main pole 424 and yokes 436 , although in a skewed or offset manner.
- the first turn 438 a is at least substantially aligned with yoke tip 437 a on leading edge side 423
- the first turn 438 b is at least substantially aligned with yoke tip 437 b on the trailing edge side 425 , but the first turn 438 b is recessed farther away from the ABS 422 , because as indicated above, yoke tips 437 are not aligned with each other.
- coil structure 428 is at least substantially aligned with yoke tip 437 a on leading edge side 423 and with yoke tip 437 b on trailing edge side 425 .
- FIG. 5 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements of FIG. 5 are the same as or similar to like elements of FIGS. 2 through 4 , whether called out or not.
- a write head 500 has an air bearing surface (ABS) 522 and a main pole 524 defining a leading edge side 523 and a trailing edge side 525 .
- Main pole 524 has a pole tip 526 proximate the ABS 522 .
- On leading edge side 523 of main pole 524 is a leading yoke 536 a having a yoke tip 537 a recessed from pole tip 526
- On trailing edge side 525 is a trailing yoke 536 b having a yoke tip 537 b recessed from pole tip 526 .
- yoke tip 537 a on leading side edge 523 is even with, or aligned with, yoke tip 537 b on trailing side edge 525 ; in other implementations, tips 537 may be not aligned.
- a coil structure 528 is present around main pole 524 and yokes 536 with a plurality of active turns 538 .
- Turns 538 a are located on leading edge side 523 proximate yoke 536 a and turns 538 b are located on trailing edge side 525 proximate yoke 536 b.
- Also located on leading edge side 523 is a dummy turn 539 , which does not conduct current and thus does not create a magnetic field as do active turns 538 .
- Dummy turn 539 may be physically connected to active turns 538 or may be physically separated from all active turns 538 .
- dummy turn 539 is provided to fill the area with, for example, a less expensive material.
- dummy turn 539 is provided to facilitate forming (e.g., by plating, deposition, etc.) of write head 500 and its various elements.
- Write head 500 has a first return pole (RP 1 ) 530 (that includes a front shield, not called out) and a second return pole (RP 2 ) 532 on the opposite side of pole 524 .
- a first back via 543 connects main pole 524 to RP 1 530 by way of yoke 536 a and a second back via 545 connects main pole 524 to RP 2 532 by way of yoke 536 b.
- Coil structure 528 in this implementation, has at least two turns around main pole 524 and yokes 536 , although in a skewed or unaligned manner. As indicated above, yoke tips 537 are aligned with each other. The first turn 538 b on trailing side edge 525 is at least substantially aligned with yoke tip 537 b, but the first turn 538 a on leading edge side 523 does not at least substantially align with yoke tip 537 a, but rather is closer to the ABS 522 than yoke tip 537 a. In this implementation, coil structure 528 is at least substantially aligned only with yoke tip 537 b on trailing edge side 525 .
- FIG. 6 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements of FIG. 6 are the same as or similar to like elements of FIGS. 2 through 5 , whether called out or not.
- a write head 600 has an air bearing surface (ABS) 622 and a main pole 624 defining a leading edge side 623 and a trailing edge side 625 .
- Main pole 624 has a pole tip 626 proximate the ABS 622 .
- On leading edge side 623 of main pole 624 is a leading yoke 636 a having a yoke tip 637 a recessed from pole tip 626
- On trailing edge side 625 is a trailing yoke 636 b having a yoke tip 637 b recessed from pole tip 626 .
- yoke tip 637 a on leading side edge 623 is even with, or aligned with, yoke tip 637 b on trailing side edge 625 ; in other implementations, tips 637 may be not aligned.
- a coil structure 628 is present around main pole 624 and yokes 636 with a plurality of active turns 638 .
- Turns 638 a are located on leading edge side 623 proximate yoke 636 a and turns 638 b are located on trailing edge side 625 proximate yoke 636 b.
- Also located on leading edge side 623 is a non-magnetic dummy turn 639 .
- Write head 600 has a first return pole (RP 1 ) 630 (that includes a front shield, not called out) and a second return pole (RP 2 ) 632 on the opposite side of pole 624 .
- a first back via 643 connects main pole 624 to RP 1 630 by way of yoke 636 a and a second back via 645 connects main pole 624 to RP 2 632 by way of yoke 636 b.
- Coil structure 628 in this implementation, has at least two turns around main pole 624 and yokes 636 . As indicated above, yoke tips 637 are aligned with each other, and both first turns 638 a, 638 b are at least substantially aligned with their respective yoke tip 637 a, 637 b.
- FIG. 7 illustrates yet another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements of FIG. 7 are the same as or similar to like elements of FIGS. 2 through 6 , whether called out or not.
- a write head 700 has an air bearing surface (ABS) 722 and a main pole 724 with a pole tip 726 and defining a leading edge side 723 and a trailing edge side 725 .
- ABS air bearing surface
- a yoke 736 having a yoke tip 737 recessed from pole tip 726 .
- a coil structure 728 is present around main pole 724 and yoke 736 with a plurality of active turns 738 .
- Turns 738 a are located on leading edge side 723 proximate yoke 736 and turns 738 b are located on trailing edge side 725 .
- Also located on leading edge side 723 is an optional non-magnetic dummy turn 739 .
- Coil structure 728 in this implementation, has at least two turns around main pole 724 and yoke 636 .
- the first turn 738 on leading edge side 723 is at least substantially aligned with yoke tip 737 .
- write heads 200 , 300 , 400 , 500 , 600 , 700 , and variations thereof can be fabricated by various methods, including plating, deposition, etching, milling, and other processing techniques.
- spatially related terms including but not limited to, “bottom,” “lower”, “top,” “upper”, “beneath”, “below”, “above”, “on top”, etc., if used herein, are utilized for ease of description to describe spatial relationships of an element(s) to another.
- Such spatially related terms encompass different orientations of the device in addition to the particular orientations depicted in the figures and described herein. For example, if a structure depicted in the figures is turned over or flipped over, portions previously described as below or beneath other elements would then be above or over those other elements.
Abstract
Description
- This application is a continuation of U.S. application 14/471,959 filed Aug. 28, 2014, now U.S. Pat. No. 9,082,428, the entire disclosures of which are incorporated herein by reference for all purposes.
- A disc drive is an example of a data storage system that uses magnetic fields for writing and reading data. Transducers write information to and read information from data surfaces of the discs. In one example, transducers include a recording or write head for generating a magnetic field that aligns the magnetic moments of a magnetic medium to represent desired bits of data. Magnetic recording heads include both longitudinal and perpendicular recording techniques. Perpendicular recording is a form of magnetic recording in which magnetic moments representing bits of data are oriented perpendicularly to the surface of the recording layer. Perpendicular magnetic write heads typically include main and return poles that are separated to form a write gap and extend from pole tips located at an air-bearing surface (ABS) to a back gap region. A coil is included to generate magnetic signals through the main and return poles in response to a current conducted through the coil. The main pole tip focuses the magnetic flux density such that the magnetic fields interact with the magnetic medium to orient its magnetic moments in an up or down direction.
- As the desire for higher data rate and higher data density increases in magnetic memory storage, great challenges are placed on magnetic write head design.
- Implementations described and claimed herein provide a write head comprising a write pole, a yoke, and a coil structure helically wound around the write pole and the yoke, the coil structure having the first turn of the coil structure aligned with the tip of the yoke.
- One particular implementation is a write head having a main pole, a trailing yoke having a yoke tip; and a coil structure around the main pole and the yoke. The coil structure has a first turn with its front edge at least substantially aligned with the yoke tip.
- Another particular implementation is write head having a main pole having a pole tip proximate an air bearing surface (ABS), with the main pole having a leading side and a trailing side. The write head also includes a leading yoke having a leading yoke tip recessed from the ABS and a trailing yoke having a trailing yoke tip recessed from the ABS. A coil structure is present around the main pole and the yokes. The coil structure has a first turn on the leading side with its front edge at least substantially aligned with the leading yoke tip, and also has a first turn on the trailing side with its front edge at least substantially aligned with the trailing yoke tip.
- Yet another particular implementation is a disc drive comprising at least one magnetic storage disc, and a transducer head comprising a read head and a write head. The write head has a main pole, a trailing yoke having a yoke tip, and a coil structure around the main pole and the yoke, the coil structure having a first turn with its front edge at least substantially aligned with the yoke tip.
- This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. These and various other features and advantages will be apparent from a reading of the following detailed description.
-
FIG. 1 is a schematic top view of storage device having an example write head implemented on an end of an actuator assembly. -
FIG. 2 is a schematic cross-sectional partial side view of an example write head. -
FIG. 3 is a schematic cross-sectional partial side view of another example write head. -
FIG. 4 is a schematic cross-sectional partial side view of yet another example write head. -
FIG. 5 is a schematic cross-sectional partial side view of yet another example write head. -
FIG. 6 is a schematic cross-sectional partial side view of yet another example write head. -
FIG. 7 is a schematic cross-sectional partial side view of yet another example write head. - As indicated above, the desire for higher data rate and higher areal density results in great challenges in designing the magnetic write head. In perpendicular recording, the write head ‘writes’ information into the recording media by switching the writer's magnetic field from one polarity to the other through a driving current waveform change. When recording at high data rate (HDR), the switching speed increases. Normally, the write field magnitude will be degraded and magnitude variation will be enlarged with data rate increase. These not only cause poorer media saturation, but also cause worse transition sharpness between bits. In addition, since write field bubble expansion is slower at the track edge than in the track center, the transition curvature along the cross-track direction will become larger as the data rate increases. All these HDR effects cause a poorer signal-to-noise ratio (SNR) for the recording information. The basic requirements for writer design for high areal density recording (e.g., high linear density and high track density) include providing strong writeability, confining the field in the down-track and cross-track directions, and reducing the erase field. In the push to increase track density, reducing the trailing edge physical width of the write pole tip directly helps reduce track pitch. However, with a write field of the same magnitude, reducing write pole width could cause larger track inflation and increase of the adjacent track fringing field. The large adjacent track fringing field will degrade the write field cross-track gradient and worsen the track edge erase band. This in turn will limit the track density push. Confining the field in the cross-track direction by including a side shield in the writer, for example, will improve cross-track field gradient and reduce the erase band. Thus, the track density may see a big improvement. However, a reliability issue is during transition writing; magnetization's dynamic activity in a side shield will cause a side track erasure field that will ruin the recording information in side tracks.
- The present disclosure provides writer designs, or write head designs, that can significantly increase the write speed (e.g., faster switching) and improve driving current-write field efficiency, thus benefiting HDR performance. The write designs have a shorter magnetic field rise time while decreasing the coil power needed to achieve the magnetic field. The lower coil power will correspond to lower erasure field, benefiting writer's reliability
- An implementation of a recording head disclosed herein includes a coil structure having its first turn at least substantially aligned with the end or tip of the trailing side or top yoke. The alignment of the coil structure with the yoke tip increases the switching speed of the write head and decreases the power usage, both which improve high data rate performance. In some implementations, the difference in distance between the coil to the ABS and the yoke tip to the ABS is no more than 10 nm. In other implementations, the difference in distance between the coil to the ABS and the yoke tip to the ABS is no more than 20 nm, or 50 nm. In some implementations, a difference in distance between the coil to the ABS and the yoke tip and the ABS is no more than 100 nm. In some implementations, the offset or difference in distance is no more than 20% of the diameter of the wind or turn of the coil. In other implementations, the offset or difference in distance is no more than 10% or even no more than 5% of the distance between the coil to the ABS, and in yet other implementations the offset or difference in distance is no more than 10% or even no more than 5% of the distance between the yoke tip to the ABS.
- In the following description, reference is made to the accompanying drawing that forms a part hereof and in which are shown by way of illustration at least one specific implementation. The following description provides additional specific implementations. It is to be understood that other implementations are contemplated and may be made without departing from the scope or spirit of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense. While the present disclosure is not so limited, an appreciation of various aspects of the disclosure will be gained through a discussion of the examples provided below.
- In some instances, a reference numeral may have an associated sub-label consisting of a lower-case letter to denote one of multiple similar components. When reference is made to a reference numeral without specification of a sub-label, the reference is intended to refer to all such multiple similar components.
-
FIG. 1 illustrates astorage device 100 having an example recording head structure implemented on an end of an actuator assembly. Specifically,FIG. 1 illustrates a top plan view of an implementation of a magnetic media ordisc 102 with atransducer head 104 situated on an end of anactuator assembly 106.Disc 102 rotates about a disc axis ofrotation 108 during operation in the direction indicated. Further,disc 102 includes anouter diameter 110 andinner diameter 112 between which are a number ofdata tracks 114, illustrated by dotted lines. Data tracks 114 are substantially circular and are made up of regularly spaced patterned bits. - Information may be written to and read from the patterned bits on
data tracks 114 through the use ofactuator assembly 106, which rotates during adata track 114 seek operation about an actuator axis ofrotation 116.Transducer head 104, mounted onactuator assembly 106 at an end distal from the actuator axis ofrotation 116, flies in close proximity above the surface ofdisc 102 during disc operation.Transducer head 104 includes a recording head including a read pole for reading data fromtrack 114 and a write pole for writing data to track 114. -
FIG. 1 also illustrates an expanded view of a partial cross-sectional configuration oftransducer head 104, particularly, of awrite head portion 120 oftransducer head 104. Writehead 120 is illustrated with its air bearing surface (ABS) 122 near magnetic media ordisc 102. The direction of rotation ofdisc 102 is indicated in the expanded view. - Specifically,
write head 120 includes a main pole 124 (also referred to as the write pole) configured to write data todisc 102 by a magnetic field.Main pole 124 is made of a ferromagnetic material such as, but not limited to, iron (Fe), cobalt (Co), nickel (Ni), and combinations thereof. For example,main pole 124 can comprise an alloy such as, but not limited to, iron and cobalt (FeCo), iron and nickel (FeNi), cobalt, iron and nickel (CoFeNi), iron and aluminum nitride (FeAlN), iron and tantalum nitride (FeTaN), cobalt, iron and boron (CoFeB), cobalt and iron nitride (CoFeN), and the like. - Write
head 120 also includes ayoke 126, which facilitates switching of the magnetic flux frommain pole 124. Ayoke tip 127 is recessed from theABS 122 and from the tip ofmain pole 124.Yoke 126 and itsyoke tip 127 are made of a high magnetic moment material, such as iron cobalt (FeCo), cobalt iron nickel (CoFeNi), and the like. - Write
head 120 is energized using acoil structure 128 present aroundmain pole 124 andyoke 126 with a plurality of turns.Coil structure 128 may be a helical coil wrapped aroundmain pole 124 andyoke 126, orcoil structure 128 may be composed of planar coils present on each side ofmain pole 124 andyoke 126.Coil structure 128 is made of an electrically conductive material such as, but not limited to, copper (Cu), silver (Ag), gold (Au), and combinations thereof.Coil structure 128 generates a magnetic field to rotate the magnetization inyoke 126 andmain pole 124 from behindABS 122; the rotation or switching happens when a magnetic domain wall propagates to theABS 122. -
Coil structure 128 is positioned so that it is at least substantially aligned withyoke tip 127. In other words,yoke tip 127 and the front edge ofcoil structure 128 are substantially the same distance from theABS 122. In some implementations, the difference in distance betweencoil structure 128 to theABS 122 andyoke tip 127 and theABS 122 is no more than 10 nm. In other implementations, the difference in distance betweencoil structure 128 to theABS 122 andyoke tip 127 and theABS 122 is no more than 20 nm, or 50 nm. In some implementations, a difference in distance betweencoil structure 128 to theABS 122 andyoke tip 127 and theABS 122 is no more than 100 nm. In some implementations, the offset or difference in distance is no more than 20% of the diameter of the wind ofcoil structure 128. In other implementations, the offset or difference in distance is no more than 10% or even no more than 5% of the distance betweencoil structure 128 to theABS 122, and in yet other implementations the offset or difference in distance is no more than 10% or even no more than 5% of the distance betweenyoke tip 127 to theABS 122. Example distances fromABS 122 toyoke tip 127 and/coil structure 128 include distances between 1 and 2 micrometers, such as 1.2 micrometers, 1.3 micrometers, 1.5 micrometers, and 1.8 micrometers. - Such a write head design, having the first coil turn of the coil structure at least substantially aligned with the yoke tip, improves the efficiency of the coil structure by positioning the yoke(s) so that it receives optimum magnetic flux from the active turns, thus improving high data rate performance and efficiency. The configuration provides an efficient writer, reducing both magnetic rise time (i.e., the time to fully reverse saturate a pole) and amplitude of current needed to saturate the pole tip, as well as reducing erasure flux. As described above, a magnetic flux in the pole propagates to the
ABS 122 fromcoil structure 128 andmain pole 124. The longer the travelling distance for the magnetic flux, the slower the switching of the magnetic orientation. Thus, moving the coil closer to theABS 122 reduces the travelling distance and the magnetization complexity, so that switching speed is increased. The configuration also requires less writing power, thus providing overall electrical and thermal-mechanical improvements. Additional implementations of write heads having the first coil turn at least substantially aligned with the yoke tip are described below. -
FIG. 2 illustrates awrite head 200 having an air bearing surface (ABS) 222, a main pole 224 (also referred to as the write pole) defining aleading edge side 223 and a trailingedge side 225; leadingedge side 223 engages the disc prior tomain pole 224 engaging the disc as it spins, and trailingedge side 225 engages the disc aftermain pole 124 engages the disc as it spins.Main pole 224 has apole tip 226 proximate theABS 222. On trailingedge side 225 ofmain pole 224 is ayoke 236 having ayoke tip 237 recessed frompole tip 226. Acoil structure 228 is present aroundmain pole 224 andyoke 236 as a plurality ofturns 238. - Write
head 200 has a first return pole (RP1) 230 on leadingedge side 223 ofpole 224 and a second return pole (RP2) 232 on trailingedge side 225 ofpole 224.RP2 232 includes afront shield 234 extending towardsmain pole 224 at theABS 222;front shield 234 may be integral withRP2 232 or may be a separate element, either or the same or different material thanRP2 232. A first back via 243 connectsmain pole 224 toRP1 230 by way ofyoke 236 and a second back via 245 connectsmain pole 224 toRP2 232. -
Coil structure 228 extends betweenmain pole 224 andRP1 230 and betweenmain pole 224/yoke 236 andRP2 232.Coil structure 228 may be a helical coil wrapped aroundmain pole 224 andyoke 236, orcoil structure 228 may be composed of planar coils present on leadingedge side 223 ofmain pole 224 and on trailingedge side 225 ofyoke 236. In this implementation,coil structure 228 has threeturns 238 on each side ofmain pole 224 andyoke 236. Eachturn 238 ofcoil structure 228 is connected in series with the other turns 238 ofcoil structure 228, at least on that side ofmain pole 224. However, any suitable configuration ofcoil structure 228 can be utilized; for example,coil structure 228 can comprise a plurality of coils (e.g., three coils) each forming separate electric circuits. In one implementation, a dielectric or insulating material (not shown), such as alumina (Al2O3), electrically insulatescoil structure 228 frommain pole 224 andRP1 230 and frommain pole 224/yoke 236 andRP2 232. - A
front edge 239 offirst turn 238 of coil structure 228 (i.e., the turn closest to the ABS 222) is at least substantially aligned withyoke tip 237; that is, the distance fromedge 239 offirst turn 238 to theABS 222 is at least substantially the same as the distance fromyoke tip 237 to theABS 222. In some implementations, the difference in distance betweenedge 239 offirst turn 238 to theABS 222 and yoke tip 227 to theABS 222 is no more than 1 nm. In other implementations, the difference in distance betweenedge 239 to theABS 122 and yoke tip 227 to theABS 222 is no more than 2 nm. -
FIG. 3 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements ofFIG. 3 are the same as or similar to like elements ofFIG. 2 . - In
FIG. 3 , awrite head 300 has an air bearing surface (ABS) 322, amain pole 324 having apole tip 326 proximate theABS 222, and ayoke 336 having ayoke tip 337 recessed frompole tip 326. Acoil structure 328 is present aroundmain pole 324 andyoke 336 as a plurality ofturns 338. - Write
head 300 has a first return pole (RP1) 330 and a second return pole (RP2) 332 on the opposite side ofpole 324.RP2 332 includes afront shield 334 extending towardsmain pole 324 at theABS 322. A first back via 343 connectsmain pole 324 toRP1 330 by way ofyoke 336 and a second back via 345 connectsmain pole 324 toRP2 332. -
Coil structure 328 wraps betweenmain pole 324 andRP1 330 and betweenmain pole 324/yoke 336 andRP2 332. In this implementation,coil structure 328 has twoturns 338 on each side ofmain pole 324 andyoke 336. Eachturn 338 ofcoil structure 328 is connected in series with the other turns 338 ofcoil structure 328, however, any suitable configuration ofcoil structure 328 can be utilized. In one implementation, a dielectric or insulating material (not shown), such as alumina (Al2O3), electrically insulatescoil structure 328 frommain pole 324 andRP1 330 and frommain pole 324 andRP2 332. - An
edge 339 of thefirst turn 338 of coil structure 328 (i.e., the turn closest to the ABS 322) is at least substantially aligned withyoke tip 337. -
FIG. 4 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements ofFIG. 4 are the same as or similar to like elements ofFIG. 2 andFIG. 3 , whether called out or not. - In
FIG. 4 , awrite head 400 has an air bearing surface (ABS) 422 and amain pole 424 defining aleading edge side 423 and a trailingedge side 425.Main pole 424 has apole tip 426 proximate theABS 422. On leadingedge side 423 ofmain pole 424 is aleading yoke 436 a having ayoke tip 437 a recessed frompole tip 426, and on trailingedge side 425 is a trailingyoke 436 b having ayoke tip 437 b recessed frompole tip 426. Leadingyoke 436 a may alternately or additionally be referred to as a “bottom yoke” and trailing yoke 426 b may alternately or additionally be referred to as a “top yoke.” In the illustrated implementation,yoke tip 437 a on leadingside edge 423 is not even or aligned withyoke tip 437 b on trailingside edge 425. - A
coil structure 428 is present aroundmain pole 424 and yokes 436 as a plurality of turns 438. Turns 438 a are located on leadingedge side 423proximate yoke 436 a and turns 438 b are located on trailingedge side 425proximate yoke 436 b. - Write
head 400 has a first return pole (RP1) 430 (that includes a front shield, not called out) and a second return pole (RP2) 432 on the opposite side ofpole 424. A first back via 443 connectsmain pole 424 toRP1 430 by way ofyoke 436 a and a second back via 445 connectsmain pole 424 toRP2 432 by way ofyoke 436 b. -
Coil structure 428, in this implementation, has two turns 438 on each side ofmain pole 424 and yokes 436, although in a skewed or offset manner. Thefirst turn 438 a is at least substantially aligned withyoke tip 437 a on leadingedge side 423, and thefirst turn 438 b is at least substantially aligned withyoke tip 437 b on the trailingedge side 425, but thefirst turn 438 b is recessed farther away from theABS 422, because as indicated above, yoke tips 437 are not aligned with each other. In this implementation,coil structure 428 is at least substantially aligned withyoke tip 437 a on leadingedge side 423 and withyoke tip 437 b on trailingedge side 425. -
FIG. 5 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements ofFIG. 5 are the same as or similar to like elements ofFIGS. 2 through 4 , whether called out or not. - In
FIG. 5 , awrite head 500 has an air bearing surface (ABS) 522 and amain pole 524 defining aleading edge side 523 and a trailingedge side 525.Main pole 524 has apole tip 526 proximate theABS 522. On leadingedge side 523 ofmain pole 524 is aleading yoke 536 a having ayoke tip 537 a recessed frompole tip 526, and on trailingedge side 525 is a trailingyoke 536 b having ayoke tip 537 b recessed frompole tip 526. In the illustrated implementation,yoke tip 537 a on leadingside edge 523 is even with, or aligned with,yoke tip 537 b on trailingside edge 525; in other implementations, tips 537 may be not aligned. - A
coil structure 528 is present aroundmain pole 524 and yokes 536 with a plurality of active turns 538. Turns 538 a are located on leadingedge side 523proximate yoke 536 a and turns 538 b are located on trailingedge side 525proximate yoke 536 b. Also located on leadingedge side 523 is adummy turn 539, which does not conduct current and thus does not create a magnetic field as do active turns 538.Dummy turn 539 may be physically connected to active turns 538 or may be physically separated from all active turns 538. - To reduce potential flux leakage from
coil structure 528 to leading back via 543 and other bulky magnetic materials far away from theABS 522, the distance between the last active turn 538 and back via 543 is increased. Although the area between active turn 538 and back via 543 could be filled with the dielectric or insulating material (e.g., alumina) surroundingcoil structure 528,dummy turn 539 is provided to fill the area with, for example, a less expensive material. In some implementations,dummy turn 539 is provided to facilitate forming (e.g., by plating, deposition, etc.) ofwrite head 500 and its various elements. - Write
head 500 has a first return pole (RP1) 530 (that includes a front shield, not called out) and a second return pole (RP2) 532 on the opposite side ofpole 524. A first back via 543 connectsmain pole 524 toRP1 530 by way ofyoke 536 a and a second back via 545 connectsmain pole 524 toRP2 532 by way ofyoke 536 b. -
Coil structure 528, in this implementation, has at least two turns aroundmain pole 524 and yokes 536, although in a skewed or unaligned manner. As indicated above, yoke tips 537 are aligned with each other. Thefirst turn 538 b on trailingside edge 525 is at least substantially aligned withyoke tip 537 b, but thefirst turn 538 a on leadingedge side 523 does not at least substantially align withyoke tip 537 a, but rather is closer to theABS 522 thanyoke tip 537 a. In this implementation,coil structure 528 is at least substantially aligned only withyoke tip 537 b on trailingedge side 525. -
FIG. 6 illustrates another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements ofFIG. 6 are the same as or similar to like elements ofFIGS. 2 through 5 , whether called out or not. - In
FIG. 6 , awrite head 600 has an air bearing surface (ABS) 622 and amain pole 624 defining aleading edge side 623 and a trailingedge side 625.Main pole 624 has apole tip 626 proximate theABS 622. On leadingedge side 623 ofmain pole 624 is aleading yoke 636 a having ayoke tip 637 a recessed frompole tip 626, and on trailingedge side 625 is a trailingyoke 636 b having ayoke tip 637 b recessed frompole tip 626. In the illustrated implementation,yoke tip 637 a on leadingside edge 623 is even with, or aligned with,yoke tip 637 b on trailingside edge 625; in other implementations, tips 637 may be not aligned. - A
coil structure 628 is present aroundmain pole 624 and yokes 636 with a plurality of active turns 638. Turns 638 a are located on leadingedge side 623proximate yoke 636 a and turns 638 b are located on trailingedge side 625proximate yoke 636 b. Also located on leadingedge side 623 is anon-magnetic dummy turn 639. - Write
head 600 has a first return pole (RP1) 630 (that includes a front shield, not called out) and a second return pole (RP2) 632 on the opposite side ofpole 624. A first back via 643 connectsmain pole 624 toRP1 630 by way ofyoke 636 a and a second back via 645 connectsmain pole 624 toRP2 632 by way ofyoke 636 b. -
Coil structure 628, in this implementation, has at least two turns aroundmain pole 624 and yokes 636. As indicated above, yoke tips 637 are aligned with each other, and both first turns 638 a, 638 b are at least substantially aligned with theirrespective yoke tip -
FIG. 7 illustrates yet another implementation of a write head having the first coil turn of the coil structure at least substantially aligned with the yoke tip. Unless indicated otherwise, the elements ofFIG. 7 are the same as or similar to like elements ofFIGS. 2 through 6 , whether called out or not. - In
FIG. 7 , awrite head 700 has an air bearing surface (ABS) 722 and amain pole 724 with apole tip 726 and defining aleading edge side 723 and a trailingedge side 725. On leadingedge side 723 is ayoke 736 having ayoke tip 737 recessed frompole tip 726. - A
coil structure 728 is present aroundmain pole 724 andyoke 736 with a plurality of active turns 738. Turns 738 a are located on leadingedge side 723proximate yoke 736 and turns 738 b are located on trailingedge side 725. Also located on leadingedge side 723 is an optionalnon-magnetic dummy turn 739.Coil structure 728, in this implementation, has at least two turns aroundmain pole 724 and yoke 636. The first turn 738 on leadingedge side 723 is at least substantially aligned withyoke tip 737. - All of the write heads described above, write
heads - The above specification and examples provide a complete description of the structure and use of exemplary implementations of the invention. The above description provides specific implementations. It is to be understood that other implementations are contemplated and may be made without departing from the scope or spirit of the present disclosure. The above detailed description, therefore, is not to be taken in a limiting sense. While the present disclosure is not so limited, an appreciation of various aspects of the disclosure will be gained through a discussion of the examples provided.
- Unless otherwise indicated, all numbers expressing feature sizes, amounts, and physical properties are to be understood as being modified by the term “about.” Accordingly, unless indicated to the contrary, the numerical parameters set forth are approximations that can vary depending upon the desired properties sought to be obtained by those skilled in the art utilizing the teachings disclosed herein.
- As used herein, the singular forms “a”, “an”, and “the” encompass implementations having plural referents, unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
- Spatially related terms, including but not limited to, “bottom,” “lower”, “top,” “upper”, “beneath”, “below”, “above”, “on top”, etc., if used herein, are utilized for ease of description to describe spatial relationships of an element(s) to another. Such spatially related terms encompass different orientations of the device in addition to the particular orientations depicted in the figures and described herein. For example, if a structure depicted in the figures is turned over or flipped over, portions previously described as below or beneath other elements would then be above or over those other elements.
- Since many implementations of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended. Furthermore, structural features of the different implementations may be combined in yet another implementation without departing from the recited claims.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/798,998 US9286918B1 (en) | 2014-08-28 | 2015-07-14 | Write head with coil structure aligned with yoke |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/471,959 US9082428B1 (en) | 2014-08-28 | 2014-08-28 | Write head with coil structure aligned with yoke |
US14/798,998 US9286918B1 (en) | 2014-08-28 | 2015-07-14 | Write head with coil structure aligned with yoke |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/471,959 Continuation US9082428B1 (en) | 2014-08-28 | 2014-08-28 | Write head with coil structure aligned with yoke |
Publications (2)
Publication Number | Publication Date |
---|---|
US20160064018A1 true US20160064018A1 (en) | 2016-03-03 |
US9286918B1 US9286918B1 (en) | 2016-03-15 |
Family
ID=53506818
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/471,959 Active US9082428B1 (en) | 2014-08-28 | 2014-08-28 | Write head with coil structure aligned with yoke |
US14/798,998 Expired - Fee Related US9286918B1 (en) | 2014-08-28 | 2015-07-14 | Write head with coil structure aligned with yoke |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/471,959 Active US9082428B1 (en) | 2014-08-28 | 2014-08-28 | Write head with coil structure aligned with yoke |
Country Status (2)
Country | Link |
---|---|
US (2) | US9082428B1 (en) |
JP (1) | JP2016051495A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9082428B1 (en) * | 2014-08-28 | 2015-07-14 | Seagate Technology Llc | Write head with coil structure aligned with yoke |
US9230570B1 (en) | 2014-08-28 | 2016-01-05 | Seagate Technology Llc | Write head having two yokes |
US9697852B2 (en) * | 2015-11-06 | 2017-07-04 | Seagate Technology Llc | Single coil turn data writer |
US9805742B1 (en) * | 2017-02-28 | 2017-10-31 | Seagate Technology Llc | Selective data writer coil |
US9934795B1 (en) | 2017-06-09 | 2018-04-03 | Seagate Technology Llc | Recording head with first and second coils that induce flux into write pole and shield |
US10916263B1 (en) | 2019-11-05 | 2021-02-09 | Headway Technologies, Inc. | Split yoke design for high data rate TAMR writer head structure |
Family Cites Families (60)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4950914A (en) | 1972-09-14 | 1974-05-17 | ||
JPS5914101A (en) | 1982-07-14 | 1984-01-25 | Hitachi Ltd | Magnetic recording and reproducing system |
DE3330023A1 (en) | 1983-08-19 | 1985-02-28 | Siemens AG, 1000 Berlin und 8000 München | COMBINED WRITING AND READING MAGNET HEAD FOR A RECORDING MEDIUM TO BE MAGNETIZED |
DE3330075A1 (en) | 1983-08-19 | 1985-02-28 | Siemens AG, 1000 Berlin und 8000 München | WRITING / READING MAGNET HEAD FOR A RECORDING MEDIUM TO BE MAGNETIZED |
DE3346777A1 (en) | 1983-12-23 | 1985-07-04 | Siemens AG, 1000 Berlin und 8000 München | THICK LAYER MAGNETIC HEAD FOR VERTICAL (VERTICAL) RECORDING |
JP2628854B2 (en) | 1986-01-16 | 1997-07-09 | シャープ株式会社 | Thin film magnetic head |
JPH02130710A (en) | 1988-11-11 | 1990-05-18 | Hitachi Ltd | Magnetic disk device |
US6195233B1 (en) | 1993-03-15 | 2001-02-27 | Kabushiki Kaisha Toshiba | Perpendicular thin-film magnetic head |
US6038106A (en) | 1995-05-10 | 2000-03-14 | International Business Machines Corporation | Piggyback magneto-resistive read/write tape head with optimized process for same gap read/write |
US6798615B1 (en) | 2000-03-24 | 2004-09-28 | Seagate Technology Llc | Perpendicular recording head with return poles which reduce flux antenna effect |
US20020071208A1 (en) | 2000-12-08 | 2002-06-13 | Sharat Batra | Perpendicular magnetic recording head to reduce side writing |
US20020135943A1 (en) | 2001-03-22 | 2002-09-26 | Matsushita Electric Industrial Co., Ltd. | Noiseless magnetic head apparatus and flopply disk drive using the same |
JP2005526339A (en) | 2001-08-21 | 2005-09-02 | シーゲイト テクノロジー エルエルシー | Magnetic recording head including spatially pumped spin wave mode writer |
JP3950725B2 (en) * | 2002-04-05 | 2007-08-01 | 新科實業有限公司 | Thin film magnetic head, method of manufacturing the same, and magnetic recording apparatus |
JP2004103092A (en) | 2002-09-09 | 2004-04-02 | Hitachi Ltd | Perpendicular recording magnetic head, its manufacturing method, and magnetic disk device having the perpendicular recording magnetic head mounted thereon |
US7006327B2 (en) | 2003-02-27 | 2006-02-28 | Western Digital (Fremont), Inc. | Thin film recording head with a buried coil providing a shortened yoke and improved dimension control |
US7394621B2 (en) | 2004-06-30 | 2008-07-01 | Headway Technologies, Inc. | Using bilayer lithography process to define neck height for PMR |
US7672079B2 (en) * | 2004-07-07 | 2010-03-02 | Headway Technologies, Inc. | Pole width control on plated bevel main pole design of a perpendicular magnetic recording head |
US7567409B2 (en) | 2004-09-09 | 2009-07-28 | Hitachi Global Storage Technologies Netherlands B.V. | Multilayer narrow pitch tape head array |
US7535674B2 (en) | 2004-09-09 | 2009-05-19 | Hitachi Global Storage Technologies Netherlands B.V. | Narrow pitch tape head array using an orthogonal backgap |
JP2006139873A (en) * | 2004-11-12 | 2006-06-01 | Hitachi Global Storage Technologies Netherlands Bv | Perpendicular magnetic head and perpendicular magnetic recording apparatus |
JP3992285B2 (en) * | 2004-12-16 | 2007-10-17 | 独立行政法人科学技術振興機構 | Thin-film magnetic head and manufacturing method thereof |
US8390962B2 (en) | 2005-09-29 | 2013-03-05 | HGST Netherlands B.V. | Lapping method and station to achieve tight dimension controls for both read and write elements of magnetic recording heads and magnetic storage device formed thereby |
US7515381B2 (en) * | 2005-12-22 | 2009-04-07 | Hitachi Global Storage Technologies Netherlands B.V. | Method for fabricating a side shield for a flux guide layer for perpendicular magnetic recording |
US7656612B2 (en) * | 2006-05-31 | 2010-02-02 | Headway Technologies, Inc. | Magnetic head having a patterned pole layer |
JP2008234777A (en) | 2007-03-22 | 2008-10-02 | Hitachi Global Storage Technologies Netherlands Bv | Magnetic head for perpendicular recording |
US8004792B2 (en) | 2007-04-12 | 2011-08-23 | International Business Machines Corporation | Magnetic write transducer |
US7855853B2 (en) | 2007-06-20 | 2010-12-21 | Seagate Technology Llc | Magnetic write device with a cladded write assist element |
US8339736B2 (en) | 2007-06-20 | 2012-12-25 | Seagate Technology Llc | Wire-assisted magnetic write device with low power consumption |
US8537494B1 (en) * | 2007-11-06 | 2013-09-17 | Western Digital (Fremont), Llc | PMR head with an angled stitch layer |
KR20090047157A (en) * | 2007-11-07 | 2009-05-12 | 삼성전자주식회사 | Perpendicular magnetic recording head and method for manufacturing the same |
US8179636B1 (en) | 2008-03-05 | 2012-05-15 | Western Digital (Fremont), Llc | Method and system for providing a perpendicular magnetic recording writer |
US8035922B2 (en) | 2008-08-19 | 2011-10-11 | Hitachi Global Storage Technologies Netherlands, B.V. | Write head with integrated coil and shield structure |
US8218263B2 (en) * | 2008-12-22 | 2012-07-10 | Hitachi Global Storage Technologies Netherlands B.V. | Write head with different upper and lower yoke lengths and methods for making the same |
US8808524B2 (en) | 2009-01-27 | 2014-08-19 | Seagate Technology Llc | Direct electrodeposition of magnetic recording head features |
US8264792B2 (en) | 2009-05-04 | 2012-09-11 | Headway Technologies, Inc. | PMR writer device with multi-level tapered write pole |
US8125732B2 (en) | 2009-08-25 | 2012-02-28 | Headway Technologies, Inc. | Tapered PMR write pole with straight side wall portion |
US8472146B2 (en) | 2010-08-27 | 2013-06-25 | HGST Netherlands B.V. | Current perpendicular magnetoresistive sensor with a dummy shield for capacitance balancing |
US8347489B2 (en) * | 2010-09-01 | 2013-01-08 | Hitachi Global Storage Technologies Netherlands B.V. | Method for manufacturing a perpendicular magnetic write head having a leading edge tapered write pole, self aligned side shield and independent trailing shield |
US8749919B2 (en) | 2010-12-09 | 2014-06-10 | Headway Technologies, Inc. | Magnetic head for perpendicular magnetic recording with shield around main pole |
US8649124B2 (en) * | 2010-12-13 | 2014-02-11 | Seagate Technology Llc | Double shell writers |
US8358487B2 (en) | 2011-01-05 | 2013-01-22 | Headway Technologies, Inc. | Thin-film magnetic head having coil of varying thinknesses in spaces adjacent the main magnetic pole |
US8405930B1 (en) | 2011-03-23 | 2013-03-26 | Western Digital (Fremont), Llc | Method and system for providing a transducer having dual, ABS recessed auxiliary poles on opposite sides of a main pole with non-magnetic spacer adjoining back portion of main pole and positioned between auxiliary poles |
US8547659B1 (en) | 2011-05-09 | 2013-10-01 | Western Digital (Fremont), Llc | System for providing a transducer having a main coil and an additional coil separated from the main pole by a write shield |
US8345384B1 (en) | 2011-12-02 | 2013-01-01 | Headway Technologies, Inc. | Magnetic head for perpendicular magnetic recording having a main pole and a shield |
US8670214B1 (en) * | 2011-12-20 | 2014-03-11 | Western Digital (Fremont), Llc | Method and system for providing enhanced thermal expansion for hard disk drives |
US8804280B2 (en) | 2012-02-03 | 2014-08-12 | Seagate Technology Llc | Actively synchronizing magnetic responses of a shield and a write pole |
US8472135B1 (en) * | 2012-03-09 | 2013-06-25 | HGST Netherlands B.V. | Microwave-assisted magnetic recording head having a current confinement structure |
US8687318B2 (en) | 2012-03-13 | 2014-04-01 | Seagate Technology Llc | Recording head coil structure |
US8416528B1 (en) | 2012-05-03 | 2013-04-09 | Headway Technologies, Inc. | Magnetic head for perpendicular magnetic recording having a return path section |
US8786983B1 (en) | 2012-06-25 | 2014-07-22 | Western Digital (Fremont), Llc | Magnetic writer having a low aspect ratio two layer coil |
JP5813591B2 (en) * | 2012-07-25 | 2015-11-17 | 株式会社東芝 | Magnetic recording head, head gimbal assembly including the same, and disk device |
US8649125B1 (en) | 2012-09-14 | 2014-02-11 | Seagate Technology Llc | Pole tip shield for a magnetic write element having notched or truncated side shields |
US8842387B1 (en) | 2013-03-14 | 2014-09-23 | HGST Netherlands B.V. | Microwave-assisted magnetic recording (MAMR) head with highly resistive magnetic material |
US8917480B2 (en) | 2013-04-12 | 2014-12-23 | Western Digital (Fremont), Llc | Magnetic recording transducers having slim shaped additional poles |
US8929029B2 (en) | 2013-04-16 | 2015-01-06 | Headway Technologies, Inc. | High data rate writer design |
US9183853B2 (en) * | 2013-04-19 | 2015-11-10 | HGST Netherlands B.V. | Magnetic write head having a stacked coil architecture for high data rate performance |
US8817418B1 (en) | 2013-08-15 | 2014-08-26 | Tdk Corporation | Magnetic head for perpendicular magnetic recording having a write shield |
US8879208B1 (en) | 2013-12-02 | 2014-11-04 | Headway Technologies, Inc. | Umbrella shield writer (UmSW) design for perpendicular magnetic recording (PMR) |
US9082428B1 (en) * | 2014-08-28 | 2015-07-14 | Seagate Technology Llc | Write head with coil structure aligned with yoke |
-
2014
- 2014-08-28 US US14/471,959 patent/US9082428B1/en active Active
-
2015
- 2015-07-14 US US14/798,998 patent/US9286918B1/en not_active Expired - Fee Related
- 2015-08-20 JP JP2015162780A patent/JP2016051495A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US9082428B1 (en) | 2015-07-14 |
US9286918B1 (en) | 2016-03-15 |
JP2016051495A (en) | 2016-04-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4923267B2 (en) | Magnetic writing apparatus for patterned media with enhanced writing magnetic field | |
US9286918B1 (en) | Write head with coil structure aligned with yoke | |
US8810964B2 (en) | Magnetic recording head having a pole tip shield and a pole-shield gap region | |
JP5933369B2 (en) | Device with writing pole tip | |
US8189294B2 (en) | Apparatus including modified write pole tip | |
US8446691B2 (en) | Magnetic recording device | |
US8873199B2 (en) | Recording head coil structure | |
US8149537B2 (en) | Magnetic writer with multi-component shield | |
US8279562B2 (en) | Magnetic recording head with magnetic wall angle | |
US8164852B2 (en) | Magnetic head having shield and recording apparatus employing the same | |
JP2010003351A (en) | Magnetic head assembly and magnetic recording and reproducing device | |
JP2015072726A (en) | Magnetic recording head and disk device provided with the same | |
JP2011048895A (en) | Perpendicular magnetic recording system having transverse auxiliary pole for fast switching of write pole magnetization, and write head | |
US7889458B2 (en) | Write head with self-cross biased pole for high speed magnetic recording | |
US7369360B2 (en) | Perpendicular recording head having controlled permeability and saturation moment | |
US9495996B2 (en) | Writer with increased write field | |
US9384769B2 (en) | Write pole configuration | |
US9159340B1 (en) | Coil structure for write head | |
US9230570B1 (en) | Write head having two yokes | |
US9153257B1 (en) | Write head having reduced dimensions | |
US9070384B1 (en) | Perpendicular magnetic recording write head with plate having coil regions and heat-sink regions |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SEAGATE TECHNOLOGY LLC, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XUE, JIANHUA;QIU, JIAOMING;RIVKIN, KIRILL;AND OTHERS;SIGNING DATES FROM 20150105 TO 20150218;REEL/FRAME:036081/0394 |
|
ZAAA | Notice of allowance and fees due |
Free format text: ORIGINAL CODE: NOA |
|
ZAAB | Notice of allowance mailed |
Free format text: ORIGINAL CODE: MN/=. |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |