Writer structure with assisted bias

• US 7,397,633 B2
• Filed: 03/01/2005
• Issued: 07/08/2008
• Est. Priority Date: 03/01/2005
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Gao, Kaizhong, Kief, Mark Thomas, Ryan, Patrick Joseph, van Ek, Johannes, Xue, Song Sheng, Heinonen, Olle Gunner, Amin, Nural
• Primary Examiner(s): EVANS, JEFFERSON A
• Application Number:
  US11/069,792
• Publication Number:
  US 20060198047A1
• Time in Patent Office: 1,225 Days
• Field of Search: 360/126, 360/125.3, 360/125.03, 360/125.13, 360/125.71
• US Class Current: 360/125.3
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: G11B 5/265 Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track G11B5/33 takes precedence in thin film structures G11B5/31
• CPC Class Codes: H01F 10/3268 the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn

Abstract

A recording head for use with a storage medium is provided. The recording head includes a substrate, a magnetic pole, a first magnetic bias structure positioned on a first side of the magnetic pole, and a second magnetic bias structure positioned on a second side of the magnetic pole, Spacer material is positioned between the magnetic pole and the first magnetic bias structure and between the magnetic pole and the second magnetic bias structure.

Claims

1. A recording head for use with a storage medium, comprising:

a substrate having an edge;

a magnetic pole;

a first magnetic bias structure positioned on the edge on a first side of the magnetic pole;

a second magnetic bias structure positioned on the edge on a second side of the magnetic pole that is opposite the first side;

spacer material positioned between the magnetic pole and the first magnetic bias structure and between the magnetic pole and the second magnetic bias structure; and

a soft magnetic shield, wherein the spacer material is positioned between the magnetic pole and the soft magnetic shield.

2. The recording head of claim 1 wherein at least one of the first and second magnetic bias structures includes a seed layer, a hard magnetic film layer and a spacer layer.

3. The recording head of claim 1 wherein at least one of the first and second magnetic bias structures includes a seed layer, an anti-ferromagnetic layer and a ferromagnetic layer.

4. The recording head of claim 1 wherein the soft magnetic shield is positioned between at least one of the first and second magnetic bias structures and the magnetic pole.

5. The recording head of claim 1, wherein each of the first and second magnetic bias structures includes a surface that faces the storage medium and is proximate the air bearing surface.

6. The recording head of claim 1, wherein the first and second magnetic bias structures are adapted to orient the magnetic field of the magnetic pole in a direction that extends from the first magnetic bias structure to the second magnetic bias structure and is substantially parallel to the air bearing surface.

7. The recording head of claim 1, wherein the spacer material is non-magnetic such that the magnetic pole is magnetically decoupled from the first magnetic bias structure and the second magnetic bias structure.

8. A head, comprising:

a substrate having a trailing edge;

a magnetic pole tip coupled to the trailing edge of the substrate;

a coil adapted to orient a magnetic field of the magnetic pole tip; and

an assist mechanism spaced apart from the pole tip and adapted to provide a supplemental magnetic field, wherein the assist mechanism includes an RF oscillator.

9. The head of claim 8 wherein the assist mechanism is adapted to orient the magnetic field of the magnetic pole tip to be substantially parallel to the trailing edge of the substrate.

10. The head of claim 8 wherein the assist mechanism is adapted to orient the magnetic field of the magnetic pole to be substantially perpendicular to the trailing edge of the substrate.

11. The head of claim 8, wherein the RF oscillator includes an oscillating layer and a polarizing layer.

12. The head of claim 11, wherein the RF oscillator includes a spacer positioned between the oscillating layer and the polarizing layer.

13. The head of claim 12, wherein the oscillating layer is positioned between an air bearing surface of the head and the polarizing layer.

14. The head of claim 8, wherein the RF oscillator is oriented along a plane that is substantially parallel to an air bearing surface of the head.

15. The head of claim 8, wherein the RF oscillator is oriented along a plane that is substantially perpendicular to an air bearing surface of the head.

16. A head, comprising:

a substrate having a trailing edge;

a magnetic pole tip coupled to the trailing edge of the substrate;

a coil adapted to orient a magnetic field of the magnetic pole tip; and

an assist mechanism spaced apart from the pole tip and adapted to provide a supplemental

magnetic field, wherein the assist mechanism is adapted to orient the magnetic field of the magnetic pole to be substantially perpendicular to the trailing edge of the substrate.

17. The head of claim 16, wherein the assist mechanism includes:

a first magnetic bias structure positioned on a first side of the magnetic pole tip; and

a second magnetic bias structure positioned on a second side of the magnetic pole tip that is opposite the first side, the second side being further away from the trailing edge than the first side.

18. The head of claim 17, and further comprising a non-magnetic spacer positioned such that the first magnetic bias structure and the second magnetic bias structure are magnetically decoupled from the magnetic pole tip.

19. The head of claim 16, wherein the assist mechanism includes a bias coil.