WO2004003892A1 - 薄膜磁気ヘッド、およびその製造方法 - Google Patents
薄膜磁気ヘッド、およびその製造方法 Download PDFInfo
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- WO2004003892A1 WO2004003892A1 PCT/JP2003/008218 JP0308218W WO2004003892A1 WO 2004003892 A1 WO2004003892 A1 WO 2004003892A1 JP 0308218 W JP0308218 W JP 0308218W WO 2004003892 A1 WO2004003892 A1 WO 2004003892A1
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- magnetic
- thin
- yoke
- magnetic head
- film
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Classifications
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- 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
- G11B5/265—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3176—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps
- G11B5/3179—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes
- G11B5/3183—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes intersecting the gap plane, e.g. "horizontal head structure"
-
- 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
- G11B5/3916—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide
-
- 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
- G11B5/3916—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide
- G11B5/3919—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path
- G11B5/3922—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure
- G11B5/3925—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure the two parts being thin films
-
- 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
- G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
Definitions
- the present invention relates to a magnetic head for writing and / or reading data to and from a magnetic recording medium, and particularly to a hard disk drive (hereinafter simply referred to as an HDD).
- the present invention relates to a thin-film magnetic head used for a magnetic recording device to be used, and a method for manufacturing the same.
- a magnetic head that writes, reads, or reads data from an HDD magnetic disk has been known.
- the magnetic head moves in a substantially radial direction of the magnetic disk by swinging a suspension arm with respect to the rotating magnetic disk.
- this type of magnetic head is formed by depositing a coil, a main pole, a return yoke, and the like on a substrate, and polishing an end face extending along the deposition direction of the deposit. . Then, a magnetic head is attached to the tip of the suspension arm such that the polished end face, that is, the end face where the ends of the main pole and the return yoke are exposed, faces the magnetic disk.
- the gap between the end of the main pole exposed on the end face facing the magnetic disk and the end of the return yoke is narrowed in order to increase the recording density for the magnetic disk by steepening the magnetic field gradient. What is effective is the power of The Institute of Electrical and Electronics Engineers (IEEE). (IEEE Transactions on Magnetics, vol. 38, No. 1, pp. 163-168, January 2002).
- the length (TH; slot height) of the portion of the main pole facing the return pole via a narrow gap (TH; slot height) is 100 nm. If it becomes longer, the magnetic field generated by the magnetic head becomes weaker, and the magnetic field of the strength required for data recording cannot be obtained.However, using a two-dimensional computer simulation, The results of the optimization of the structure are shown in the literature (IEICE Technical Report, Vol.101, No.499, MR2001-87, pp.21-27, 2001).
- the main pole and the return yoke in order to increase the recording density by steepening the magnetic field gradient and obtain a magnetic field of sufficient strength necessary for data recording, the main pole and the return yoke must be as close as possible and the opposite part It is necessary to shorten the minute length TH.
- the above-described conventional magnetic head is formed by polishing deposits deposited on a substrate at an end surface extending along the direction of accumulation, so that the main pole and the return yoke face each other.
- the length TH of the facing portion is determined by the degree of polishing. For this reason, in order to reduce the length TH of the facing portion to several 10 nm, it is necessary to increase the polishing accuracy, but it is currently impossible to increase the polishing accuracy to about several 10 nm. It is considered impossible at the technical level.
- An object of the present invention is to provide a thin-film magnetic head capable of increasing the recording density on a magnetic recording medium, and a method for manufacturing the same. It is in.
- a thin-film magnetic head of the present invention has a tip which is exposed on a facing surface facing a magnetic recording medium and has a magnetic thin film extending in a direction away from the facing surface.
- a return pole yoke that is provided substantially parallel to the main pole, has a tip exposed on the opposing surface, and is formed of a magnetic thin film extending away from the opposing surface;
- the length of the opposing portion of the auxiliary yoke, which is disposed at the main pole with a predetermined gap therebetween, facing the main magnetic pole depends on the film thickness of the auxiliary yoke.
- the thin-film magnetic head of the present invention comprises a magnetic yoke having a tip exposed on a surface facing a magnetic recording medium, and a magnetic yoke for obtaining a signal magnetic flux from the magnetic recording medium via the magnetic yoke.
- the method of manufacturing a thin-film magnetic head includes the steps of: placing a main pole made of a magnetic thin film, a return path yoke made of a magnetic thin film, and a coil made of a conductive thin film on a substrate via an insulating layer.
- the method for manufacturing a thin-film magnetic head of the present invention includes a deposition step of depositing a main pole, a return path yoke, and a coil on a substrate via an insulating material, and a deposit deposited in the deposition step.
- An auxiliary yoke made of a magnetic thin film extending flush with the main magnetic pole in a non-contact state with a predetermined gap between the main magnetic pole and the opposing surface at one end in the stacking direction facing the magnetic recording medium; And an auxiliary yoke forming step of forming by stacking in the same direction.
- FIG. 1A is an external perspective view of a magnetic head according to a first embodiment of the present invention as viewed from a magnetic disk side.
- FIG. 1A is a partially enlarged view showing a partially enlarged main part of FIG. 1A.
- Figure 2A is a cross-sectional view of the magnetic head of Figure 1A.
- FIG. 2B is a partially enlarged view showing a partially enlarged main part of FIG. 2A.
- FIG. 3 is a graph showing a gradient distribution of a recording magnetic field along a track direction when a separation length between a main pole of a magnetic head and an auxiliary yoke is set as a parameter.
- Fig. 4 shows the case where the thickness of the auxiliary yoke is used as a parameter.
- Graph showing the gradient distribution of the recording magnetic field along the track direction.
- Fig. 5 is a graph showing the relationship between the number of faces of the auxiliary yoke facing the main pole and the maximum magnetic field strength.
- FIG. 6 is a graph showing the recording magnetic field intensity distribution along the track width direction when the separation length is set as a parameter.
- FIG. 7 is a graph showing the relationship between the recording magnetic field strength and the magnetic field gradient when the size of the auxiliary yoke is changed.
- FIG. 8A is a bottom view of an auxiliary yoke having a rectangular opening as viewed from a magnetic disk side.
- FIG. 8B is a contour diagram showing a distribution of a recording magnetic field intensity applied to the magnetic disk when the auxiliary yoke of FIG. 8A is employed.
- FIG. 9A is a bottom view of the auxiliary yoke having an opening formed with a substantially circular opening at four corners as viewed from the magnetic disk side.
- FIG. 9B is a contour diagram showing a recording magnetic field intensity distribution applied to the magnetic disk when the auxiliary yoke of FIG. 9A is employed.
- FIG. 10A and FIG. 10B are explanatory views for explaining a first example of a method of manufacturing an auxiliary yoke.
- 11A to 11C are explanatory diagrams for explaining a second example of the method of manufacturing the catching yoke.
- FIGS. 12A and 12B are explanatory diagrams for explaining a third example of the method of manufacturing the auxiliary yoke.
- FIGS. 13A and 13B are explanatory diagrams for explaining a fourth example of the method of manufacturing the catching yoke.
- FIG. 14A and Fig. 14B are used to explain the treatment method when the size of the capture yoke is changed and the opposing surface becomes uneven.
- FIG. 14A and Fig. 14B are used to explain the treatment method when the size of the capture yoke is changed and the opposing surface becomes uneven.
- FIG. 15 is a graph showing magnetic recording characteristics when the thickness of the auxiliary yoke manufactured by the method described with reference to FIGS. 12A and 12B is used as a parameter.
- FIG. 16 is a sectional view showing a magnetic head according to a second embodiment of the present invention.
- FIG. 17 is a diagram showing a modified example of FIG.
- FIG. 18 is a sectional view showing a magnetic head according to a third embodiment of the present invention.
- FIG. 19 is a diagram showing a modification of FIG.
- FIG. 20 is a sectional view showing a magnetic head according to a fourth embodiment of the present invention.
- FIG. 21 is a diagram showing a modification of FIG. 20.
- FIG. 22 is a sectional view showing a recording / reproducing magnetic head according to a fifth embodiment in which the magnetic head of FIG. 2 and the magnetic head of FIG. 18 are formed on the same substrate. -.
- FIG. 23 is a sectional view showing a recording / reproducing magnetic head according to a sixth embodiment in which the magnetic head of FIG. 16 and the magnetic head of FIG. 20 are formed on the same substrate.
- FIG. 1A does not show a thin-film magnetic head 1 (hereinafter, simply referred to as a magnetic head 1) according to the first embodiment of the present invention, as viewed from a magnetic disk (magnetic recording medium) side. Show a schematic perspective view It is.
- Fig. IB shows a partially enlarged view of the main part of Fig. 1A.
- FIG. 2A is a cross-sectional view of the magnetic head 1 cut along a plane extending along the track direction of the magnetic disk. Further, FIG. 2B is a partially enlarged view in which a main part of FIG. 2A is partially enlarged. In FIG. 1A, the coil is not shown for simplicity.
- the track direction refers to a direction along a track formed concentrically on a magnetic disk (not shown), in other words, a direction perpendicular to the radial direction of the magnetic disk.
- the width direction refers to the radial direction of the magnetic disk.
- the magnetic head 1 of the present embodiment includes, for example, a recording head for recording information on a perpendicular magnetic recording type magnetic disk (not shown) having a two-layer film structure having a soft magnetic layer. Function.
- Alte I click (Al 2 0 3 - T iC ) In example example and this depositing multiple materials onto a which insulating material or we made flat substrate 2 Formed.
- the material deposition direction matches the track direction.
- Deposits deposited on the substrate 2 include a main magnetic pole 4 made of a magnetic thin film such as iron silicon nitrogen (FeSiN), and two coils 6a and 6b made of copper. Includes two return pass yokes 8a, 8b, etc., composed of magnetic thin films such as Balt zirconium niobium (CoZrNb), etc.
- the two coils 6a, 6b extend the main pole 4 along the deposition direction.
- the return path yokes 8a and 8b are provided to be spaced apart from the main magnetic pole 4 in a sandwiching positional relationship, and are spaced apart from each other in a sandwiching positional relationship to sandwich the coil.
- the distance between the main pole 4 and the two return pass yokes 8a, 8b is 100 ⁇ ⁇ ! It is desirable to set the wavelength to about 500 nm, and in the present embodiment, it is set to about 360 nm.
- Coils 6a and 6b are arranged between the main pole 4 and the two return pass yokes 8a and 8b, respectively.
- main pole 4 and coils 6a and 6b are sealed between the two return pass yokes 8a and 8.b, for example, by using an aluminum (A1 2 0 3), silicon oxide (Si0 2) of which the insulating layer 7 is provided.
- the above-described deposit and the substrate 2 have opposing surfaces 12 which are made coplanar by polishing an end surface extending along the deposition direction.
- the opposing surface 12 of the magnetic head 1 extends substantially parallel to the deposition direction.
- the magnetic head 1 is arranged such that the facing surface 12 faces the surface of a magnetic disk (not shown).
- an auxiliary yoke 10 made of a magnetic thin film such as iron silicon nitrogen (FeSiN) is provided on the facing surface 12.
- the auxiliary yoke 10 of the present embodiment is provided by etching the insulating layer 7, and its surface is formed by the end surface of the substrate 2, the front end surface 4 a of the main pole 4, and the return noise.
- the yokes 8a and 8b extend along the stacking direction so as to form an opposing surface 12 together with the end surfaces.
- the auxiliary yoke 10 has a rectangular opening in a non-contact state surrounding the rectangular tip surface 4 a (tip) where the main pole 4 is exposed on the facing surface 12.
- the opening of this rectangle The mouth has four opening end faces 10 a corresponding to the thickness of the auxiliary yoke 10, and all the opening end faces 10 a face the main pole 4 in a non-contact state.
- the auxiliary yoke 10 forms a magnetic circuit with the main pole 4, the return pass yokes 8a and 8b, and the coils 6a and 6b.
- the gap between the side face 4 b near the tip face 4 a of the main pole 4 and the open end face 10 a of the auxiliary shock 10 functions as a magnetic gap and has a predetermined separation.
- the separation length is desirably set to 100 nm to 200 nm, and in the present embodiment, the separation length is set to 100 nm.
- this rectangular frame-shaped magnetic gap is referred to as an opening 20.
- each coil 6a, 6b is illustrated as a single turn for simplicity of illustration, but the two coils 6a, 6b are respectively wound three times, and Connected at the center. Then, currents in opposite directions are applied to the respective coils 6 a and 6 b via a drive circuit (not shown) to excite the main pole 4, so that the tip surface 4 a of the main pole 4 is applied to the main pole 4. A strong recording magnetic field is generated.
- a very hard protective film such as diamond-like carbon (DLC) is generally formed on the facing surface 12 described above.
- DLC diamond-like carbon
- the magnetic field strength distribution of the magnetic head 1 configured as described above is considered based on the calculation results using the three-dimensional finite element method.
- the separation length was constant over the entire circumference of the main pole 4.
- FIG. 3 shows the relationship between the magnetic field strength and the magnetic field gradient obtained from the magnetic field strength distribution along the track direction when the separation length of the magnetic head 1 having the above-described structure is variously changed.
- the peak of the magnetic field gradient appears in a region where the magnetic field intensity is relatively strong. This indicates that there is a problem that a high magnetic field gradient cannot always be obtained with the magnetic field intensity required for recording.
- the auxiliary yoke 10 and making the separation length smaller than 200 nm it can be seen that the magnetic field gradient can be increased in a wide range of magnetic field strength.
- FIG. 4 shows the relationship between the magnetic field strength and the magnetic field gradient when the thickness of the capture yoke 10 of the magnetic head 1 having the above-described structure is variously changed. According to this, when the auxiliary yoke 10 is made thicker, the maximum magnetic field strength is significantly reduced.Thus, by making the thickness of the auxiliary yoke 10 at least thinner than 200 nm, It can be seen that the above effects can be enjoyed.
- the relative running direction of the magnetic head 1 with respect to the magnetic disk that is, the side surface 4b of the main pole 4 on the leading side along the track direction and the open end face 10a of the auxiliary yoke 10 Since the gap between them has no direct relation to the recording state, the separation length of that part can be set freely. However, as can be seen from Fig. 5, even if the separation length of one side is changed from the same narrow value as the other three sides to infinity, there is almost no change in the recording magnetic field strength, so the leading end face of the main pole 4 is not changed. 4 Rere a problem to form a minute gap with about all four sides of a 0
- FIG. 6 shows the relationship between the distance away from the center of the main pole 4 in the track width direction and the magnetic field strength at that position when the separation length is a parameter. According to this, it can be seen that the spread of the magnetic field strength distribution is suppressed as the separation length decreases. In other words, by reducing the separation length, it is possible to suppress the spread of the magnetic field strength distribution in the width direction with respect to the track of the magnetic disk, and to steepen the magnetic field in the track width direction. In addition, the recording density can be increased.
- a rectangular opening of the auxiliary yoke 10 is formed so that the four end faces 10a are surrounded by relatively narrow gaps on all four sides of the tip face 4a of the main pole 4.
- the effect of providing the above-described rectangular frame-shaped opening 20 is such that the auxiliary yoke 10 just connects the two return path yokes 8a and 8b to each other.
- the auxiliary yoke were reduced (external dimensions: width 2.4 ⁇ m X length 2.4 m), the obtained magnetic field steepness did not change much.
- the auxiliary yoke was further reduced and the auxiliary yoke was separated from the return pass yoke (external dimensions: 1.6 m wide x 1.4 m long).
- the magnetic head 1 of the present embodiment has a feature that the degree of freedom is large with respect to the external dimensions of the auxiliary yoke 10 and the positional relationship with respect to the return yoke 8a, 8b. I understand.
- the thickness of the auxiliary yoke 10 and the size of the opening 20, that is, the separation length are important for generating a steep magnetic field and obtaining a sufficient magnetic field strength.
- the shape of the opening 20 may be modified by utilizing the fact that the steepness of the magnetic field is affected by the separation length.
- FIG. 8A shows, as described above, the circumference of the tip surface 4 a of the main pole 4.
- a rectangular frame-shaped opening 20 for forming a constant gap in the frame is shown
- FIG. 8B shows a case where the opening 20 of this shape is applied to the magnetic disk.
- the intensity distribution of the magnetic field is shown in a contour diagram.
- FIG. 9A shows an opening 20 ′ having a substantially circular opening at the four corners
- FIG. 9B employs this opening 20 ′.
- the contour map of the magnetic field intensity distribution at this time is shown.
- the shape of the magnetization transition to be drawn can be an arc shape having a polarity opposite to that of the magnetization transition of the opening of the auxiliary yoke, and a suitable linear magnetization transition shape can be obtained.
- FIGS. 1OA to 14B a method for manufacturing the magnetic head 1 having the above-described structure will be described with reference to FIGS. 1OA to 14B and some examples.
- a layer of one return pass yoke 8a is formed on the substrate 2, and the coil 6a and the main magnetic pole 4a are formed via the insulating layer 7.
- a coil 6b, and another return pass yoke 8b are sequentially deposited.
- a protective layer 9 is formed outside the return shock 8b as needed.
- the facing surface 12 extending along the deposition direction of each layer is formed by polishing.
- an auxiliary yoke 10 is formed by applying a magnetic thin film to the polished facing surface 12.
- a method of forming the auxiliary yoke 10 on the opposing surface 12 will be described.
- a photo resist 14 is put on the opposing surface 12 and the auxiliary yoke 1 is formed by ion beam etching or reactive ion etching.
- a groove 16 having the same shape as 0 and the same depth as the thickness of the auxiliary yoke 10 is formed.
- the auxiliary yoke 10 By forming the auxiliary yoke 10 as in this example, the length of the end face 10a of the auxiliary yoke 10 facing the main pole 4 (that is, the thickness of the auxiliary yoke 10) is increased. It can be formed with high precision on the order of nm. As a result, steepening of the magnetic field intensity applied to the magnetic disk can be achieved, and at the same time, a magnetic field having a sufficient intensity required for recording can be formed.
- a magnetic thin film 10 ′ for the assisting yoke 10 is deposited on the opposing surface 12, and then, as shown in FIG. 11B.
- the photoresist 18 is patterned and the magnetic thin film is patterned as shown in FIG. 11C by ion beam etching or reactive ion etching using the photoresist as a mask.
- An opening 20 is formed at 10 '.
- the auxiliary yoke 10 When the auxiliary yoke 10 is manufactured according to the present example, the same magnetic thin film as that of the auxiliary yoke 10 is formed also on the front end face 4 a of the main pole 4. For this reason, the accuracy of the separation length can be improved as compared with the first example described above. That is, the gap between the main pole 4 and the auxiliary yoke 10 can be formed with high accuracy depending on the shape of the register 18.
- a photo resist having a shape corresponding to the opening 20 is formed on the facing surface 12 by using an electron beam exposure apparatus (not shown) or the like. Then, as shown in FIG. 13B, a magnetic thin film 10 ′ for the auxiliary yoke 10 is deposited and a lift-off is performed to form the opening 20, thereby forming an opening 20. Forming an auxiliary yoke 10 having the same. Also in this example, the same effects as in the above-described second and third examples can be obtained.
- an auxiliary yoke 10 is formed between the two return path yokes 8a and 8b, and the second to fourth auxiliary paths are formed.
- the auxiliary yoke 10 is formed over the entire opposing surface 12.
- the outer dimensions of the auxiliary yoke 10 are different from the characteristics of the magnetic head 1 of the present invention. There is no problem because the impact is extremely small. In other words, the outer diameter of the auxiliary yoke 10 is limited to the above examples. Nor.
- the auxiliary yoke 10 since the auxiliary yoke 10 is embedded in the insulating layer 7, no concavity and convexity occur on the facing surface 12 of the magnetic head 1.
- the dimension of the auxiliary yoke 10 does not cover the entire surface of the opposing surface 12 as shown in FIG. A step corresponding to the thickness of the yoke 10 occurs. If this step becomes a problem, a nonmagnetic material 24 can be applied to the recess as shown in FIG. 14B, if necessary, to eliminate the step. is there.
- the dimensions and position of the nonmagnetic material 24 can be determined so as to be optimal with respect to the capture yoke 10 from the viewpoint of the floating characteristics and wear of the magnetic head 1.
- the thickness of the auxiliary yoke 10 is set to, for example, 20. It can be easily formed with high precision below 0 nm.
- the separation length between the main pole 4 and the capture yoke 10 can be accurately determined. It can be set.
- a magnetic head 1 having an auxiliary yoke 10 manufactured according to the third example described with reference to FIGS. 12A and 12B is replaced with a magnetic disk having a two-layer film for perpendicular magnetic recording (see FIG. Review in combination with Figure 15 shows the measured magnetic recording characteristics.
- the present invention provided with the auxiliary yoke 10
- the magnetic head 1 realizes higher recording resolution, and in particular, it is considered that the steepening of the recording magnetic field along the track direction is realized. Therefore, according to the method of the present invention, it is possible to increase the recording density by improving the linear recording density.
- FIG. 16 Components that function in the same manner as in the above-described first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.
- the magnetic head 30 of the present embodiment is characterized in that a plurality of thin films are deposited in a direction perpendicular to the facing surface 12 facing a magnetic disk (not shown). . That is, the opposing surface 12 of the magnetic head 30 is a surface substantially parallel to the substrate 2.
- the magnetic head 30 is further provided with an auxiliary yoke 10 on the opposing surface 12 of the substrate 2 on which the main pole 4, the return path yoke 8, the coil 6, and the insulating layer 7 are deposited.
- This is a so-called horizontal (planar) thin-film single-pole magnetic head that has been deposited.
- the auxiliary yoke 10 has an opening 20 for forming a gap between the auxiliary yoke 10 and the main magnetic pole 4 so that the surface thereof is flush with the tip end surface 4 a of the main magnetic pole 4. It is formed by a magnetic thin film.
- a groove having the same shape as the auxiliary yoke 10 is previously formed on the facing surface 12, and then the auxiliary yoke 10 is formed.
- Fig. 17 As shown in FIG. 2, there is a method in which a magnetic thin film is formed on the opposing surface 12 including the region of the tip end surface 4 a of the main pole 4 to form the auxiliary yoke 10.
- the method of manufacturing the catching yoke 10 is the same as that of the first embodiment described above, and a detailed description thereof will be omitted.
- auxiliary yoke 10 After forming the auxiliary yoke 10, if necessary, remove the step in the thickness direction created by the auxiliary yoke 10, and form a non-magnetic thin film to secure the floating characteristics and wear characteristics of the magnetic head 30.
- a not-shown protective film such as DLC is formed.
- the same effects as those of the above-described first embodiment can be obtained, and the description of the first embodiment is omitted.
- Such a polishing step before forming the auxiliary yoke is not required, so that the capture yoke 10 can be formed at the same time during the deposition process, and the man-hour required for the manufacturing process can be reduced. This is advantageous for reducing the size and weight.
- a magnetic head 40 according to a third embodiment of the present invention will be described with reference to FIG. 18 and FIG.
- the case where the present invention is applied to a magnetic head for recording has been described.
- the case where the present invention is applied to a magnetic head for reproduction is described. Will be described.
- the magnetic head 40 guides a signal magnetic flux from a magnetic disk (not shown) to a (anisotropic, giant, tunnel) magnetoresistive element 46 via a magnetic yoke 48. It has a structure in which an auxiliary yoke 50 is arranged on the facing surface 52 of the magnetoresistive thin-film magnetic head of the conventional structure. As shown in FIG. 18, after the magnetic yoke 48 and the magnetoresistive effect element 46 are formed, the magnetic head 40 is polished to form an opposing surface 5 facing the magnetic disk. 2 is formed so as to be a predetermined position of the magnetic yoke 48.
- the polished opposing surface 52 is flush with the distal end surface of the magnetic yoke 48 via a gap between the distal end portions 48a and 48b of the magnetic yoke 48.
- An auxiliary yoke 50 made of a magnetically thin film is formed.
- auxiliary yoke 50 When forming the auxiliary yoke 50, as shown in FIG. 18, a groove having the same shape as that of the auxiliary yoke 50 is formed on the facing surface 52 in advance, and then the auxiliary yoke 50 is formed.
- the description of the method of manufacturing the auxiliary yoke 50 will be omitted.
- a non-magnetic thin film is formed to secure the height of the step in the film thickness direction created by the auxiliary yoke 50 and the floating characteristics and wear characteristics of the magnetic recording head.
- a protective film such as DLC is formed.
- the magnetic pole structure for realizing a steep recording magnetic field has the same structure as a single magnetic pole head for recording. It can easily be inferred from the theory of reciprocity that the main pole 4 is regarded as the magnetic yoke 48 of the reproducing yoke type magnetoresistive head, thereby achieving a steep reproduction sensitivity distribution. . Therefore, the auxiliary yoke 50 existing on the side surface in the track width direction at the tip of the magnetic yoke 48 is effective as a magnetic shield to reduce side crosstalk. On the other hand, it has been pointed out that waveform distortion occurs when a yoke-type magnetoresistive head is applied to perpendicular magnetic recording.
- This distortion can be reduced by drawing only the signal magnetic flux from the magnetic disk directly below the end surface of the magnetic yoke 48 into the magnetic yoke 48.
- the yoke 50 is effective as a magnetic shield to reduce the inflow of magnetic flux from other than immediately below the recording medium. Thereby, the waveform distortion is reduced, and the recording density can be improved.
- the track direction and the track direction are improved.
- the problem in the rack width direction can be reduced at the same time, and as a result, the recording density can be increased.
- the magnetic head 60 has a plurality of thin films in a direction perpendicular to the facing surface 61 facing a magnetic disk (not shown), similarly to the magnetic head for recording having a planar structure described above. Manufactured by deposition.
- the magnetic head 60 has a (anisotropic, huge, tunnel) magnetoresistive effect element 63, magnetic yokes 64a, 64b, insulating A layer 65 is deposited, and this deposit is placed on the facing surface 61 facing the magnetic disk, with a gap between the magnetic yokes 64a and 64b, and the same as the tip surface of the magnetic yoke 64.
- auxiliary yoke 66 As a method of forming the auxiliary yoke 66, as shown in FIG. 20, a groove having the same shape as that of the auxiliary yoke 66 is formed on the facing surface 61 in advance, and then the auxiliary yoke 66 is formed. As shown in FIG. 21, there is a method of forming an auxiliary yoke 66 by forming a magnetic thin film on the opposing surface 61, including the tip surface region of the magnetic yoke 64. Thereafter, if necessary, a non-magnetic thin film is formed to eliminate the steps in the film thickness direction created by the capture yoke 66, to secure the floating characteristics and wear characteristics of the magnetic head 60, or to use a DLC or the like. Form a protective film.
- the same effects as those of the above-described third embodiment can be obtained, and the present embodiment can be compared with the third embodiment.
- This magnetic head 70 has a structure in which the magnetic head 1 of the first embodiment described above and the magnetic head 40 of the third embodiment described above are formed on the same substrate 2. .
- the magnetic head 70 is a recording / reproducing head for recording and reproducing information on and from a magnetic disk.
- the magnetic head 40 of the third embodiment described above is first formed on the substrate 2, and subsequently, The magnetic head 1 according to the above-described first embodiment is formed on the magnetic head. A detailed description of the method of manufacturing the magnetic heads 1 and 40 is omitted.
- the auxiliary shocks 10 and 50 of the two magnetic heads 1 and 40 are formed simultaneously.
- the opposing surface 12 is polished, a magnetic thin film is applied on the surface, and puttering is performed, thereby forming a magnetic head for recording.
- the assisting yokes 10 and 50 of the head 1 and the reproducing magnetic head 40 are simultaneously and collectively formed. The description of the method of manufacturing the auxiliary yokes 10 and 50 is also omitted here.
- the auxiliary yoke 10 of the magnetic head 1 for recording and the auxiliary yoke 50 of the magnetic head 40 for reproduction can be simultaneously formed simultaneously.
- the number of manufacturing steps can be reduced.
- Magnetic heads can be provided.
- This magnetic head 80 has a planar structure in which the magnetic head 30 of the second embodiment described above and the magnetic head 60 of the fourth embodiment described above are formed on the same substrate 2. Having. This magnetic head 80 is also a recording / reproducing head.
- this magnetic head 80 When manufacturing this magnetic head 80, two magnetic heads 30 and 60 are manufactured simultaneously in parallel.
- This magnetic head 80 is also Similar to the magnetic head 70 of the fifth embodiment described above, the auxiliary yokes 10 and 66 can be formed simultaneously and collectively. That is, in the present embodiment, the same effects as those of the above-described fifth embodiment can be obtained. Further, according to the present embodiment, in addition to eliminating the need for the polishing step before forming the auxiliary yoke, the auxiliary yokes 10 and 66 can be simultaneously formed during the deposition steps of the other layers. The number of steps can be further reduced as compared with the fifth embodiment described above.
- the thickness of the auxiliary yoke can be easily and accurately reduced, and thus the recording magnetic field is significantly reduced.
- the recording magnetic field can be sharpened, and thereby the recording density can be increased by improving the linear recording density and the track density.
- the present invention when applied to a thin-film magnetic head for reproduction, it is possible to improve the recording density by reducing side crosstalk and waveform distortion.
- the auxiliary yoke can be formed together with the single-pole magnetic head for recording, it can be easily combined with the recording head.
- a high-resolution recording / reproducing magnetic head can be provided.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03736295A EP1533792A4 (en) | 2002-06-27 | 2003-06-27 | THIN FILM MAGNETIC HEAD AND METHOD OF MAKING THE HEAD |
US11/020,094 US20050111138A1 (en) | 2002-06-27 | 2004-12-27 | Thin-film magnetic head and its manufacturing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002188505A JP3806372B2 (ja) | 2002-06-27 | 2002-06-27 | 薄膜磁気ヘッド、およびその製造方法 |
JP2002-188505 | 2002-06-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/020,094 Continuation US20050111138A1 (en) | 2002-06-27 | 2004-12-27 | Thin-film magnetic head and its manufacturing method |
Publications (1)
Publication Number | Publication Date |
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WO2004003892A1 true WO2004003892A1 (ja) | 2004-01-08 |
Family
ID=29996821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008218 WO2004003892A1 (ja) | 2002-06-27 | 2003-06-27 | 薄膜磁気ヘッド、およびその製造方法 |
Country Status (3)
Country | Link |
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EP (1) | EP1533792A4 (ja) |
JP (1) | JP3806372B2 (ja) |
WO (1) | WO2004003892A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8000058B2 (en) | 2004-10-25 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head for perpendicular recording having pole pieces provided on surface of soft magnetic film |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7322095B2 (en) * | 2004-04-21 | 2008-01-29 | Headway Technologies, Inc. | Process of manufacturing a four-sided shield structure for a perpendicular write head |
US7289295B2 (en) * | 2004-05-12 | 2007-10-30 | Headway Technologies, Inc. | Return pole field reduction for perpendicular write head |
JP3992285B2 (ja) * | 2004-12-16 | 2007-10-17 | 独立行政法人科学技術振興機構 | 薄膜磁気ヘッド、およびその製造方法 |
WO2007074522A1 (ja) * | 2005-12-27 | 2007-07-05 | Fujitsu Limited | 磁気ヘッドおよびディスク装置 |
JP2012150863A (ja) | 2011-01-18 | 2012-08-09 | Toshiba Corp | 記録ヘッド、およびこれを備えたディスク装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6035309A (ja) * | 1983-08-08 | 1985-02-23 | Nippon Telegr & Teleph Corp <Ntt> | 垂直磁気記録ヘツド |
JPS6448217A (en) * | 1987-08-19 | 1989-02-22 | Nippon Telegraph & Telephone | Floating type magnetic head |
JPH04245009A (ja) * | 1991-01-31 | 1992-09-01 | Victor Co Of Japan Ltd | 薄膜型垂直ヘッド |
JPH06267036A (ja) * | 1993-03-17 | 1994-09-22 | Matsushita Electric Ind Co Ltd | 薄膜磁気ヘッド |
JPH07287817A (ja) * | 1994-04-15 | 1995-10-31 | Citizen Watch Co Ltd | 磁気抵抗効果型ヘッド |
-
2002
- 2002-06-27 JP JP2002188505A patent/JP3806372B2/ja not_active Expired - Lifetime
-
2003
- 2003-06-27 EP EP03736295A patent/EP1533792A4/en not_active Withdrawn
- 2003-06-27 WO PCT/JP2003/008218 patent/WO2004003892A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6035309A (ja) * | 1983-08-08 | 1985-02-23 | Nippon Telegr & Teleph Corp <Ntt> | 垂直磁気記録ヘツド |
JPS6448217A (en) * | 1987-08-19 | 1989-02-22 | Nippon Telegraph & Telephone | Floating type magnetic head |
JPH04245009A (ja) * | 1991-01-31 | 1992-09-01 | Victor Co Of Japan Ltd | 薄膜型垂直ヘッド |
JPH06267036A (ja) * | 1993-03-17 | 1994-09-22 | Matsushita Electric Ind Co Ltd | 薄膜磁気ヘッド |
JPH07287817A (ja) * | 1994-04-15 | 1995-10-31 | Citizen Watch Co Ltd | 磁気抵抗効果型ヘッド |
Non-Patent Citations (1)
Title |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8000058B2 (en) | 2004-10-25 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic head for perpendicular recording having pole pieces provided on surface of soft magnetic film |
Also Published As
Publication number | Publication date |
---|---|
JP3806372B2 (ja) | 2006-08-09 |
EP1533792A1 (en) | 2005-05-25 |
EP1533792A4 (en) | 2006-01-11 |
JP2004030838A (ja) | 2004-01-29 |
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