Method and apparatus for providing diamagnetic flux focusing in a storage device

• US 7,538,977 B2
• Filed: 04/30/2004
• Issued: 05/26/2009
• Est. Priority Date: 04/30/2004
• Status: Expired due to Fees

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Hitachi Global Storage Technologies Netherlands BV (Western Digital Corporation)
• Inventors: Gider, Savas, Hsiao, Wen-chien David
• Primary Examiner(s): Klimowicz; William J
• Application Number:
  US10/837,279
• Publication Number:
  US 20050243462A1
• Time in Patent Office: 1,852 Days
• Field of Search: 360/125, 360/126, 360/119, 360/120, 36011901-11913, 360/125.3, 360/125.71, 360/128, 360/FOR.219
• US Class Current: 360/125.71
• CPC Class Codes: G11B 5/3116 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 G11B5/3113, G11B5/245 take precedence

Abstract

A method and apparatus for providing improved flux focusing in a write head is disclosed. The present invention uses a diamagnetic material to provide flux focusing in a storage device. An embodiment of the present invention includes diamagnetic material having a magnetic susceptibility substantially equal to or greater than 1×10⁻⁵. Another embodiment of the present invention includes diamagnetic material selected from a group comprising graphite and bismuth.

Claims

1. A write head, comprising:

a pair of substantially planar, thin film write poles formed with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface; and

diamagnetic material disposed proximate the pole tips of the write poles for focusing flux into a magnetic recording medium, wherein the diamagnetic material is formed in-line with the write poles and contacts both of the write poles;

wherein the diamagnetic material further forms a flux guide adjacent to and extending the length of the sides of the write poles opposite to the write gap.

2. The write head of claim 1, wherein the diamagnetic material comprises a gap layer disposed in the write gap, wherein the write gap is formed only of the diamagnetic material.

3. A write head, comprising:

a pair of substantially planar, thin film write poles formed with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface; and

diamagnetic material selected from a group consisting of graphite and bismuth disposed proximate the pole tips of the write poles adjacent to and extending the length of the sides of the write poles outside the write gap so that a pole tip is in-line with and between the diamagnetic material and the write gap for focusing flux into a magnetic recording medium.

4. The write head of claim 3, wherein the diamagnetic material selected from the group consisting of graphite and bismuth comprises a flux guide disposed adjacent and in contact with sides of the write poles.

5. A magnetic recording system, comprising:

a write head, the write head including a pair of substantially planar, thin film write poles formed with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface;

a moveable magnetic recording medium disposed at a point proximate the write gap; and

diamagnetic material disposed proximate the pole tips of the write poles adjacent to and extending the length of the sides of the write poles outside the write gap so that a pole tip is in-line with and between the diamagnetic material and the write gap for focusing flux into a magnetic recording medium.

6. The magnetic recording system of claim 5 wherein the diamagnetic material comprises a flux guide disposed adjacent and in contact with sides of the write poles.

7. The magnetic recording system of claim 5, further comprising diamagnetic material formed as an underlayer disposed beneath a recording surface of the magnetic recording medium.

8. A magnetic recording system, comprising:

a write head, the write head including a pair of substantially planar, thin film write poles formed with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface; and

a moveable magnetic recording medium disposed at a point proximate the write gap; and

at least one layer of diamagnetic material selected from a group consisting of graphite and bismuth disposed proximate the pole tips of the write poles adjacent to and extending the length of the sides of the write poles outside the write gap so that a pole tip is in-line with and between the diamagnetic material and the write gap for focusing flux into a magnetic recording medium.

9. The magnetic recording system of claim 8, wherein the diamagnetic material selected from the group consisting of graphite and bismuth comprises a flux guide disposed adjacent to sides of the write poles opposite to the write gap.

10. The magnetic recording system of claim 8, further comprising diamagnetic material selected from the group consisting of graphite and bismuth formed as an underlayer disposed beneath a recording surface of the magnetic recording medium.

11. A method for providing improved flux focusing in a magnetic storage device, comprising:

forming a pair of substantially planar, thin film write poles with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface; and

forming diamagnetic material selected from a group consisting of graphite and bismuth for focusing the flux into a magnetic recording medium, wherein the diamagnetic material is formed proximate to the pole tips of the write poles adjacent to and extending the length of the sides of the write poles outside the write gap so that the pole tips are in-line with and between the diamagnetic material and the write gap.

12. The method of claim 11, wherein the forming at least one layer of diamagnetic material selected from the group consisting of graphite and bismuth further comprises forming a flux guide adjacent to and in contact with sides of the write poles.

13. The method of claim 11 further comprising diamagnetic material selected from the group consisting of graphite and bismuth formed as an underlayer disposed beneath a recording surface of the magnetic recording medium.

14. A method for providing improved flux focusing in a magnetic storage device, comprising:

forming a pair of substantially planar, thin film write poles with a straight length of write pole material, wherein the length of the thin film write poles is transverse to an air-bearing surface, the pair of write poles being separated by a write gap and having pole tips with ends substantially parallel to and facing the air-bearing surface; and

forming diamagnetic material for focusing the flux into a magnetic recording medium, wherein the diamagnetic material is formed proximate to the pole tips of the write poles adjacent to and extending the length of the sides of the write poles outside the write gap so that the pole tips are in-line with and between the diamagnetic material and the write gap.

15. The method of claim 14, wherein the forming the diamagnetic material further comprises forming a flux guide adjacent to and in contact with sides of the write poles.

16. The method of claim 14 further comprising forming diamagnetic material as an underlayer disposed beneath a recording surface of the magnetic recording medium.

17. A write head, comprising:

substantially planar, thin film means for writing magnetic signals to means for storing magnetic data, the substantially planar, thin film means for writing magnetic signals having a length transverse to an air-bearing surface and pole tips with ends substantially parallel to and facing the air-bearing surface;

means for forming a gap between the substantially planar, thin film means for writing magnetic signals; and

diamagnetic means, disposed proximate the pole tips of the substantially planar, thin film means for writing magnetic signals and adjacent to and extending the length of the sides of the thin film means for writing magnetic signals outside the means for forming the gap so that means for writing is in-line with and between the diamagnetic means and the means for forming the gap, for focusing flux into a magnetic recording medium.