WO2005020214A1 - 再生ヘッド及び磁気ディスク装置 - Google Patents
再生ヘッド及び磁気ディスク装置 Download PDFInfo
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- WO2005020214A1 WO2005020214A1 PCT/JP2003/010752 JP0310752W WO2005020214A1 WO 2005020214 A1 WO2005020214 A1 WO 2005020214A1 JP 0310752 W JP0310752 W JP 0310752W WO 2005020214 A1 WO2005020214 A1 WO 2005020214A1
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- WIPO (PCT)
- Prior art keywords
- electrodes
- constant current
- electrode
- head
- ground electrode
- Prior art date
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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
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/398—Specially shaped 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3929—Disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding
-
- 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
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3945—Heads comprising more than one sensitive element
- G11B5/3948—Heads comprising more than one sensitive element the sensitive elements being active read-out elements
- G11B5/3958—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition
- G11B5/3961—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition disposed at an angle to the direction of the track or relative movement
- G11B5/3964—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition disposed at an angle to the direction of the track or relative movement for transducing on a single track
Definitions
- the present invention relates to a reproducing head and a magnetic disk device using the reproducing head.
- the spin pulp magnetoresistive sensor includes a free ferromagnetic layer (free layer) whose magnetization direction changes according to an external magnetic field, a nonmagnetic conductive layer formed adjacent to the free layer, and a nonmagnetic layer.
- a pinned ferromagnetic layer (bind layer) formed adjacent to the conductive layer; and an antiferromagnetic material formed adjacent to the bind layer and made of an antiferromagnetic material that fixes the magnetization direction of the bind layer.
- a spin-valve magnetoresistive film which is a multilayer film including layers.
- the spin-valve magnetoresistive film has the magnetization direction of the free layer and the magnetization direction of the pinned layer.
- the resistance changes according to the relative angle change, and the resistance value becomes minimum when these magnetization directions are in the same direction, and becomes maximum when they are in opposite directions.
- this magnetoresistive sensor is used for a magnetic head, the magnetization direction of the pinned layer is fixed to the element height direction of the magnetoresistive element, and the magnetization direction of the free layer when no external magnetic field is applied is set. It is generally designed in the element width direction orthogonal to the binding layer.
- the resistance of the spin-valve magnetoresistive film can be linearly increased or decreased depending on whether the direction of the signal magnetic field from the magnetic recording medium is parallel or antiparallel to the magnetization direction of the pinned layer.
- Such a linear resistance change is caused by a pair of electrode terminals associated with the magnetoresistive effect film in the c magnetoresistive head, which facilitates signal processing of the magnetic disk drive.
- a sense current which is a constant current, flows from the pair of electrode terminals to the magnetoresistive film.
- the electric resistance of the magnetoresistive film changes according to the signal magnetic field from the magnetic disk. Then, a reproduction signal having an output voltage represented by the product of the electric resistance value and the sense current value is output.
- Patent Document 1 As the recording density of magnetic disk devices has increased, the core width (sense area) of a lead element formed between a pair of electrodes has become increasingly smaller, and the required core width of the lead element has become smaller. Manufacturing processes to achieve miniaturization are becoming increasingly difficult. As a result, the yield is low and the cost is considerably high.
- Patent Document 2
- an object of the present invention is to provide a reproduction head capable of minimizing the core width of a lead element.
- Another object of the present invention is to provide a magnetic disk device capable of reproducing information recorded on a magnetic disk at high speed.
- a reproducing head comprising: a lead element; first and second electrodes provided at both ends of the read element; and a gap between the first and second electrodes.
- a ground electrode provided; first constant current means for flowing a first constant current between the first electrode and the ground electrode; and a first constant current between the second electrode and the ground electrode.
- a second constant current means for flowing a different second constant current, an arithmetic means connected to the first and second electrodes, for synthesizing an output of the first electrode and an output of the second electrode, Storage means having a table in which a relation between the calculated composite value and the output of the first and second electrodes is associated with each other, and a reproducing head is provided.
- the value of the second constant current is twice the value of the first constant current.
- the calculation means includes a preamplifier and an A / D converter.
- a reproducing head comprising: a lead element; first and second electrodes provided at both ends of the read element; and a gap between the first and second electrodes.
- a ground electrode provided; first constant current means for flowing a first constant current between the first electrode and the ground electrode; and a first constant current between the second electrode and the ground electrode.
- a second constant current means for flowing a second constant current different from the first and second electrodes, a selector connected to the first and second electrodes, and selecting one of the outputs of the first and second electrodes according to a track position signal;
- a playback head characterized by comprising:
- a reproducing head comprising: a read element; first and second electrodes provided at both ends of the read element; A ground electrode provided between the first and second electrodes; N intermediate electrodes provided between the first and second electrodes (where N is a positive integer); the ground electrode and the first, second, and second electrodes; A plurality of constant current means for supplying different constant currents between the respective intermediate electrodes; and a plurality of constant current means connected to the first and second electrodes and the respective intermediate electrodes, and outputs of the first and second electrodes and the respective intermediate electrodes.
- a storage means having a table in which the relationship between the composite value calculated by the calculation means and the output of the first and second electrodes and the respective intermediate electrodes is associated; and the selected intermediate electrode Means for generating a binary signal from the output of the selected intermediate electrode Enter the binary signal in the storage means, before the case of the same composite value
- a determination means for determining the address of the table, and a playback head provided with:
- the different constant currents are integer multiples of the minimum constant current.
- the calculating means includes a preamplifier and an A / D converter
- the binary signal generating means includes an A / D converter and an offset voltage applying means.
- a magnetic disk drive comprising: a housing; a magnetic disk having a plurality of tracks rotatably housed in the housing; and writing data to the magnetic disk.
- a head slider having a playback head for reading recording data and data, and an actuator for moving the head slider across tracks of a magnetic disk;
- a read element ; first and second electrodes provided at both ends of the read element; a ground electrode provided between the first and second electrodes; and a ground electrode provided between the first electrode and the ground electrode.
- First constant current means for flowing a first constant current
- second constant current means for flowing a second constant current different from the first constant current between the second electrode and the ground electrode
- Calculating means for combining the output of the first electrode and the output of the second electrode; and a table in which the relationship between the combined value calculated by the calculating means and the output of the first and second electrodes is associated.
- a storage means having the following.
- a magnetic disk drive comprising: a housing; a magnetic disk having a plurality of tracks rotatably housed in the housing; and writing data to the magnetic disk.
- a head slider having a playback head for reading a recording head and data; and an actuator for moving the head slider across a track of a magnetic disk, wherein the playback head comprises: A lead element; first and second electrodes provided at both ends of the lead element; a ground electrode provided between the first and second electrodes; and a ground electrode provided between the first and second electrodes.
- N (where N is a positive integer) intermediate electrodes provided at a plurality of constant current means for supplying different constant currents between the ground electrode, the first and second electrodes, and each of the intermediate electrodes.
- the second 1 an arithmetic unit connected to the second electrode and each of the intermediate electrodes, for synthesizing the outputs of the first and second electrodes and each of the intermediate electrodes, and a composite value calculated by the arithmetic unit and
- a storage unit having a table in which the relationship between the first and second electrodes and the output of each of the intermediate electrodes is associated with each other; and a storage means connected to one of the selected intermediate electrodes and having the output of the selected intermediate electrode.
- Magnetic means comprising: a means for generating a binary signal; and a means for inputting the binary signal to the storage means.
- a discriminating means for discriminating the address of the table in the case of the same combined value.
- Figure 1 is a perspective view of the magnetic disk drive with the cover removed;
- FIG. 2 is a perspective view of a reproduction head according to the first embodiment of the present invention.
- Figure 3 shows the case where the magnetization direction of the free layer is the first
- FIGS. 4A to 4C show the solid state composite diagrams when the magnetization direction of the free layer shown in FIG. 3 is the first;
- Figure 5 shows the case where the magnetization direction of the free layer is the second
- FIG. 6 is a vector composite diagram in the case where the magnetization direction of the free layer is the second case shown in FIG. 5;
- FIG. 7 is a diagram showing the case where the magnetization direction of the free layer is the third case;
- FIG. 8 is a vector composite diagram in the third case where the magnetization direction of the free layer is as shown in FIG. 7;
- FIG. 9 is a diagram showing the case where the magnetization direction of the free layer is 4;
- FIG. 10 is a vector composite diagram of the fourth case in which the magnetization direction of the free layer is shown in FIG. 9;
- FIG. 11 is a schematic composite diagram of the first reproducing system of the reproducing head of the first embodiment;
- FIG. 12 is a schematic composite diagram of the second playback system of the playback head of the first embodiment
- FIG. 13 is a perspective view of a reproduction head according to the second embodiment of the present invention.
- Figure 14 shows the case where the magnetization direction of the free layer is the first
- FIG. 15 is a vector composite diagram in the case where the magnetization direction of the free layer is the first case shown in FIG. 14;
- FIG. 16 is a diagram showing the case where the magnetization direction of the free layer is the second case;
- Fig. 17 is a vector composite diagram of the second case where the magnetization direction of the free layer is the third case shown in Fig. 16;
- Fig. 18 is a diagram showing the case where the magnetization direction of the free layer is the third case;
- FIG. 19 is a vector composite diagram in the case where the magnetization direction of the free layer is the third case shown in FIG. 18;
- FIG. 20 is a diagram showing the case where the magnetization direction of the free layer is the fourth case;
- FIG. 21 is a vector composite diagram for the fourth case in which the magnetization direction of a free layer is shown in Figure 20;
- FIG. 22 is a schematic composite diagram of a playback head playback system according to the second embodiment.
- FIG. 1 there is shown a perspective view of a magnetic disk drive with a cover removed.
- a shaft 4 is fixed to the base 2, and a spindle hub (not shown) driven by a DC motor is provided around the shaft 4.
- a magnetic disk 6 and a spacer (not shown) are alternately inserted into the spindle hub, and the disk clamp 8 is fastened to the spindle hub with a plurality of screws 10 so that a plurality of magnetic disks can be inserted. 6 are attached to the spindle hub at a specified interval.
- Reference numeral 12 denotes a rotary actuator composed of an actuator arm assembly 14 and a magnetic circuit 16.
- ⁇ Chi Yu eta arm assembly 1 4, c Akuchiyue one motor arm assembly 1 4 are rotatably mounted on shafts sheet 1 8 around which is fixed to the base 2 in the shafts sheet 1 8 around via a pair of bearings A rotatable actuator tab 20, a plurality of actuator arms 22 extending in one direction from the actuator tab 20, and a tip end of each actuator arm 22. And a fixed head assembly 24.
- Each head assembly 24 includes a head slider having an electromagnetic transducer (magnetic head element) for reading and writing data to the magnetic disk 6. 26 and a suspension 28 which supports a head slider 26 at the distal end and which is fixed to the actuator arm 22 at the proximal end thereof.
- a coil (not shown) is supported on the opposite side of the shaft 18 from the actuator arm 22, and the coil is inserted into a gap of the magnetic circuit 16, and a voice coil motor (VCM) 30 is provided. It is composed.
- Reference numeral 32 denotes a flexible printed wiring board (FPC) for supplying a write signal to the electromagnetic transducer and for taking out a read signal from the electromagnetic transducer, and one end of the flexible printed circuit board 20 is provided with an actuator block 20. It is fixed on the side.
- FPC flexible printed wiring board
- the reproducing head 2 includes a pair of electrodes 8 and 10 provided on both sides of a lead element 4 such as a spin valve magnetoresistive element, and a ground electrode 6 provided between the electrodes 8 and 10.
- a first constant current flows between the electrode 8 and the ground electrode 6 by the constant current circuit 12.
- a second constant current flows between the electrode 10 and the ground electrode 6 by the constant current circuit 14.
- the second constant current is twice as large as the first constant current.
- the reproducing head X is defined between the electrode 10 and the ground electrode 6 by providing the ground electrode 6 between the pair of electrodes 8 and 10.
- the reproducing head Y can be defined between the electrode 8 and the ground electrode 6, and the core width of the reproducing head can be reduced to 1/2 or less as compared with the related art.
- FIG. 3 shows a first case of the magnetization direction of the pinned layer 16 and the free layer 22 of the reproducing head 2 of the first embodiment.
- the magnetization directions 18 and 20 of the binding layer 16 are fixed in the element height direction.
- the magnetization direction of the free layer 22 is affected by the signal magnetic field recorded on the magnetic disk, and changes rightward or leftward with respect to a straight line 25 parallel to the width direction of the lead element 4.
- the right magnetization direction 24 a of the head X is changed to “ 0 "
- the leftward magnetization direction 2 4 b is defined as" 1 "
- the leftward magnetization direction 263 is defined as "0”
- the rightward magnetization direction 26b is defined as "1”. Therefore, in the first case shown in FIG. 3, the binary values of the heads X and Y are 0 and 1, respectively.
- 4A to 4C show a vector synthesis method of the magnetization directions 24a and 26b when the magnetization direction of the free layer 22 shown in FIG. 3 is the first.
- the magnitude of the magnetization of the heads X and Y of the binding layer 16 is 1 and the magnitude of the magnetization of the heads X and Y of the free layer 22 is 2 1.
- a parallelogram is created from the magnetization directions 18 and 24a of the binding layer 16 and the free layer 22 of the head X.
- the diagonal of this parallelogram is the output of head X.
- the magnetization direction 26 b of the free layer 22 of the head Y is in the same direction as the magnetization direction 24 a of the free layer 22 of the head X.
- the magnetization direction 26 b is taken on the extension of the direction 24 a, and a parallelogram is created by the magnetization direction 26 b and the magnetization direction 20 of the pinned layer 16.
- a parallelogram is created using the vectors X and Y, and the diagonal Z is the composite output of the playback head 2.
- FIG. 5 shows the case where the magnetization direction of the free layer 22 is the second. That is, since the magnetization direction 24 a of the free layer 22 of the head is rightward, the binary value is “0”, and the magnetization direction 26 a of the free layer 22 of the head Y is leftward. Therefore, its binary value is "0".
- FIG. 6 shows a method for synthesizing a vector when the magnetization direction of the free layer 22 is the second case shown in FIG.
- FIG. 7 shows a case where the magnetization direction of the free layer 22 is the third. That is, since the magnetization direction 24 b of the free layer 22 of the head is leftward, the binary value is “1”, and the magnetization direction 26 b of the free layer 22 of the head Y is rightward. Therefore, its binary value is "1".
- FIG. 8 shows a method for synthesizing a vector when the magnetization direction of the free layer 22 is the third case shown in FIG.
- FIG. 9 shows the case where the magnetization direction of the free layer 22 is the fourth. That is, since the magnetization direction 24 b of the free layer 22 of the head X is leftward, the binary value is “1”, and the magnetization direction 26 a of the free layer 22 of the head Y is leftward. Therefore, its binary value is "0".
- FIG. 10 is a diagram showing a vector synthesis method when the magnetization direction of the free layer 22 is the fourth magnetization direction shown in FIG.
- Table 1 shows the relationship between the signal outputs of the heads X and Y described above and the combined output Z (vector length).
- FIG. 11 a schematic configuration diagram of a signal reproducing system of the reproducing head 2 of the first embodiment is shown.
- the core width (sense area) of the head X is set smaller than the width of the track 28a
- the core width (sense area) of the head Y is set smaller than the width of the track 28b.
- the outputs of electrodes 8 and 10 are input to arithmetic unit 30.
- the vector synthesis operation is performed in the operation unit 30.
- the arithmetic unit 30 includes a preamplifier 32 and an A / D converter 34 for converting an analog signal amplified by the preamplifier 32 to a digital signal.
- the relationship between the composite value calculated by the calculation unit 30 and the output of the electrodes 8 and 10 is stored in the RAM 36 in association with each other as shown in Table 1. Therefore, by inputting the vector value synthesized by the arithmetic unit 30 into the RAM 36, the signal outputs of the heads X and Y can be determined from Table 1.
- FIG. 12 there is shown a schematic configuration diagram of another embodiment of the signal reproduction system.
- the output of the electrode 8 is input to the preamplifier 40, and the output of the electrode 10 is input to the preamplifier 38.
- the preamplifiers 38, 40 are connected to the selector 42, and the output of the head X or the head Y is selected by the selector 42 according to the track position signal from the servo control system.
- the signal can be reproduced by two heads X and Y in sequence.
- the output of the selector 4 2 is converted into a digital signal Ri by the AZD converter 4 4.
- FIG. 13 there is shown a perspective view of a reproduction head 2A according to the second embodiment of the present invention.
- the reproducing head 2A of the present embodiment in addition to the electrodes 8, 10 and the ground electrode 6 of both sides, two intermediate electrodes 46, 48 are provided between the electrode 10 and the ground electrode 6. Inserted between electrode 8 and ground electrode 6 to provide substantially four regeneration heads X1-X4.
- a first constant current means causes a sense current, which is a first constant current, to flow between the intermediate electrode 48 and the ground electrode 6, and between the intermediate electrode 46 and the ground electrode 6.
- the second constant current means is flowing a sense current that is a second constant current different from the first constant current.
- the second constant current is twice the first constant current.
- a third constant current, a sense current flows between the electrode 8 and the ground electrode 6 by the third constant current means, and a fourth constant current flows between the electrode 10 and the ground electrode 6.
- the sense means which is the fourth constant current, is flowing by the current means.
- the third constant current is three times the first constant current
- the fourth constant current is four times the first constant current.
- the magnetization direction of the pinned layer 16 and the magnetization direction of the free layer 22 in the reproducing head 2A is fixed in the height direction of the lead element 4 as in the first embodiment.
- a sense current flows counterclockwise in the heads X1 and X2, and a sense current flows in the clockwise direction in the heads X3 and X4. It is. Therefore, for the heads X 1 and X 2, the rightward magnetization direction with respect to the straight line 53 parallel to the width direction of the read element 4 is defined as “0”, and the leftward magnetization direction is defined as “1”. Define.
- the magnetization direction to the left with respect to the straight line 53 is defined as “0”, and the magnetization direction to the right with respect to the line 53 is defined as “1”. Therefore, in the first case shown in FIG. 14, the magnetization direction 52 a of the head X 1 becomes “0” and the magnetization direction 54 a of the head X 2 becomes “0”.
- the magnetization direction 56b of No. 3 is "1”
- the magnetization direction 58b of head X4 is "1".
- FIG. 15 shows a method of vector synthesis of the outputs of the heads XI to X4 when the magnetization direction of the free layer 22 shown in FIG. 14 is the first.
- the magnitude of the magnetization of the binding layer 16 is 2
- the heads X1 to X4 are The magnitudes of magnetization of the Lie layer 22 are plotted as 4, 2: 1 and 3, respectively.
- FIG. 16 shows a case where the magnetization direction of the free layer 22 in the reproducing head 2A is the second.
- the magnetization direction 52 a of the head XI becomes “0”
- the magnetization direction 54 a of the head X 2 becomes “0”
- the magnetization direction 56 a of the head X 3 becomes “0”.
- the magnetization direction 58 a of the head X 4 is" 0 ".
- FIG. 18 shows the case where the magnetization direction of the free layer 22 is the third.
- the magnetization direction 52 a of the head X 1 is “0”
- the magnetization direction 54 b of the head X 2 is “1”
- the magnetization direction 56 b of the head X 3 is “1”
- the magnetization direction 58a of the head X4 becomes "0”.
- the magnetization direction of the free layer 22 shown in FIG. 18 is the third
- the combined output Z can be obtained by the vector combining method shown in FIG.
- FIG. 20 shows the case where the magnetization direction of the free layer 22 is the fourth. That is, head X
- the magnetization direction 5 2a of 1 is “0”
- the magnetization direction 54 a of the head X 2 is “0”
- the magnetization direction 56 b of the head X 3 is “1”
- the magnetization of the head X 4 The direction 58a is "0”.
- a composite output Z can be obtained for 16 magnetization directions of the free layer 22, and the results are shown in Table 2.
- the composite output Z indicates the length of the vector or the magnitude of the output level.
- FIG. 22 there is shown a schematic configuration diagram of a playback system of the playback head 2A of the second embodiment.
- the reproducing heads 2A are arranged so that the heads XI to X4 respectively read the recorded information of the tracks 60a to 60d.
- the outputs of the electrodes 8, 10 and the intermediate electrodes 46, 48 are input to the operation unit 30, and a vector operation for synthesizing these outputs is executed in the operation unit 30.
- the operation unit 3 ⁇ includes a preamplifier 32 and an A / D converter 34.
- the relationship between the composite value calculated by the calculation unit 30 and the output of the electrodes 8, 10, 46, 48 is stored in the RAM 36 in association with each other as shown in Table 2.
- the output of the head X3 that is, the intermediate electrode 4
- the output of 8 is input to the preamplifier 62, and the analog signal amplified by the preamplifier 62 is input to the binary signal generation unit 64.
- the analog signal is converted into a digital signal by the A / D converter 66.
- the output of A / D converter 66 is shown in Table 2 as Z 1 (X 3). Therefore, by adding the old offset voltage 68, that is, 1.74 V to Zl (X3) by the adder 70, the data "0.00" and "0.91 Is obtained. This data is rounded and added to RAM 36 as the address of "0" and "1". If the overlapping composite output Z is divided by this address in the RAM 36, the overlapping composite output Z can be determined.
- the present invention it is possible to provide a reproducing head capable of minimizing the core width of a read element. Therefore, it is possible to provide a magnetic disk device capable of reproducing information recorded on the magnetic disk at high speed.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2003/010752 WO2005020214A1 (ja) | 2003-08-26 | 2003-08-26 | 再生ヘッド及び磁気ディスク装置 |
JP2005508200A JP4079279B2 (ja) | 2003-08-26 | 2003-08-26 | 再生ヘッド及び磁気ディスク装置 |
US11/315,652 US7408730B2 (en) | 2003-08-26 | 2005-12-22 | Reproducing head and magnetic disk drive |
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PCT/JP2003/010752 WO2005020214A1 (ja) | 2003-08-26 | 2003-08-26 | 再生ヘッド及び磁気ディスク装置 |
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US11/315,652 Continuation US7408730B2 (en) | 2003-08-26 | 2005-12-22 | Reproducing head and magnetic disk drive |
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WO2005020214A1 true WO2005020214A1 (ja) | 2005-03-03 |
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US9786301B1 (en) | 2014-12-02 | 2017-10-10 | Western Digital (Fremont), Llc | Apparatuses and methods for providing thin shields in a multiple sensor array |
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JPS5933616A (ja) * | 1982-08-17 | 1984-02-23 | Matsushita Electric Ind Co Ltd | 薄膜磁気ヘツド |
JPH01296422A (ja) * | 1988-05-24 | 1989-11-29 | Fujitsu Ltd | 磁気抵抗効果型ヘッド |
JPH10149519A (ja) * | 1996-11-15 | 1998-06-02 | Read Rite S M I Kk | 複合形薄膜磁気ヘッド |
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US5079663A (en) * | 1990-01-29 | 1992-01-07 | International Business Machines Corporation | Magnetoresistive sensor with track following capability |
US5555142A (en) * | 1990-09-27 | 1996-09-10 | Kabushiki Kaisha Toshiba | Magnetic disk system |
US5751521A (en) * | 1996-09-23 | 1998-05-12 | International Business Machines Corporation | Differential spin valve sensor structure |
US6185079B1 (en) * | 1998-11-09 | 2001-02-06 | International Business Machines Corporation | Disk drive with thermal asperity reduction circuitry using a magnetic tunnel junction sensor |
US7436632B2 (en) * | 2004-06-30 | 2008-10-14 | Seagate Technology Llc | Differential/dual CPP recording head |
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2003
- 2003-08-26 WO PCT/JP2003/010752 patent/WO2005020214A1/ja active Application Filing
- 2003-08-26 JP JP2005508200A patent/JP4079279B2/ja not_active Expired - Fee Related
-
2005
- 2005-12-22 US US11/315,652 patent/US7408730B2/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5933616A (ja) * | 1982-08-17 | 1984-02-23 | Matsushita Electric Ind Co Ltd | 薄膜磁気ヘツド |
JPH01296422A (ja) * | 1988-05-24 | 1989-11-29 | Fujitsu Ltd | 磁気抵抗効果型ヘッド |
JPH10149519A (ja) * | 1996-11-15 | 1998-06-02 | Read Rite S M I Kk | 複合形薄膜磁気ヘッド |
Also Published As
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US20060098322A1 (en) | 2006-05-11 |
US7408730B2 (en) | 2008-08-05 |
JPWO2005020214A1 (ja) | 2006-10-19 |
JP4079279B2 (ja) | 2008-04-23 |
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