Magnetic recording head with non-magnetic bump structure formed on spin torque oscillator

Patent metadata

Field	Value
Publication number	US-9230573-B1
Application number	US-201514602160-A
Country	US
Kind code	B1
Filing date	Jan 21, 2015
Priority date	Jan 21, 2015
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A magnetic write head having a write pole with a tapered trailing edge and a magnetic oscillator formed on the trailing edge of the write pole. The magnetic oscillator is sandwiched between the magnetic write pole and a trailing magnetic shield. The write head also includes a non-magnetic, electrically conductive bump structure located over a back portion of the magnetic oscillator between the magnetic oscillator and the trailing magnetic shield. The presence of the non-magnetic, electrically conductive bump structure causes electrons to properly flow through the magnetic oscillator in a direction that is generally perpendicular to the plane of the magnetic oscillator, even when the magnetic oscillator is formed on an inclined plane on the tapered trailing edge of the write pole. This thereby ensures optimal performance of the magnetic oscillator.

First claim

What is claimed is:

1. A magnetic write head, comprising:
a magnetic write pole extending to a media facing surface and having a tapered trailing edge;
a magnetic oscillator structure formed on the tapered trailing edge of the magnetic write pole;
a non-magnetic, electrically conductive layer formed on a portion of the magnetic oscillator that is removed from the media facing surface; and
a magnetic shield formed over the magnetic oscillator structure and non-magnetic, electrically conductive layer;
wherein at least a portion of the non-magnetic, electrically conductive layer is located between the magnetic oscillator structure and the magnetic shield.

2. The magnetic write head as in claim 1 wherein the non-magnetic, electrically conductive layer is in the form of a bump.

3. The magnetic write head as in claim 1 wherein the magnetic oscillator has a back edge that is removed from the media facing surface, the write head further comprising a non-magnetic, electrically insulating refill layer extending from the back edge of the magnetic oscillator structure in a direction away from the media facing surface.

4. The magnetic write head as in claim 3 wherein the non-magnetic, electrically conductive layer extends over a portion of the non-magnetic, electrically insulating fill layer.

5. The magnetic write head as in claim 1 wherein the non-magnetic, electrically conductive layer comprises Cu.

6. The magnetic write head as in claim 3 wherein the non-magnetic, electrically insulating fill layer comprises alumina.

7. The magnetic write head as in claim 1 wherein the tapered trailing edge of the write pole defines an angle of about 25 degrees relative to a plane that is perpendicular to the media facing surface.

8. The magnetic write head as in claim 1 wherein the tapered trailing edge of the write pole defines an angle of 20-30 degrees relative to a plane that is perpendicular to the media facing surface.

9. The magnetic write head as in claim 1 further comprising circuitry connected with the write pole and the magnetic shield for supplying an electrical current through the magnetic oscillator.

10. The magnetic write head as in claim 8 wherein the presence of the non-magnetic, electrically conductive layer causes electrons to flow through the magnetic oscillator in a direction that is substantially perpendicular to the magnetic oscillator.

11. The magnetic write head as in claim 1 wherein the magnetic oscillator is a spin torque oscillator.

12. The magnetic write head as in claim 1 wherein magnetic oscillator further comprises a magnetic spin injection layer having a pinned magnetization, a magnetic oscillation layer having an unpinned magnetization, and a non-magnetic inter-layer disposed between the magnetic spin injection layer and the magnetic oscillation layer.

13. A magnetic data recording system, comprising:
a housing;
a magnetic media moveably held within the housing;
a slider;
an actuator for moving the slider adjacent to the magnetic media; and
a write head formed on the slider, the write head further comprising:
a magnetic write pole extending to a media facing surface and having a tapered trailing edge;
a magnetic oscillator structure formed on the tapered trailing edge of the magnetic write pole;
a non-magnetic, electrically conductive layer formed on a portion of the magnetic oscillator that is removed from the media facing surface; and
a magnetic shield formed over the magnetic oscillator structure and non-magnetic, electrically conductive layer wherein
at least a portion of the non-magnetic, electrically conductive layer is located between the magnetic oscillator structure and the magnetic shield.

14. The magnetic data recording system as in claim 13 , wherein the non-magnetic, electrically conductive layer is in the form of a bump.

15. The magnetic data recording system as in claim 14 , wherein the magnetic oscillator has a back edge that is removed from the media facing surface, the write head further comprising a non-magnetic, electrically insulating refill layer extending from the back edge of the magnetic oscillator structure in a direction away from the media facing surface.

16. The magnetic data recording system as in claim 15 , wherein the non-magnetic, electrically conductive layer extends over a portion of the non-magnetic, electrically insulating fill layer.

17. The magnetic data recording system as in claim 13 , wherein the non-magnetic, electrically conductive layer comprises Cu.

18. The magnetic data recording system as in claim 15 , wherein the non-magnetic, electrically insulating fill layer comprises alumina.

19. The magnetic data recording system as in claim 13 , wherein the tapered trailing edge of the write pole defines an angle of about 25 degrees relative to a plane that is perpendicular to the media facing surface.

20. The magnetic data recording system as in claim 13 , wherein the tapered trailing edge of the write pole defines an angle of 20 to 30 degrees relative to a plane that is perpendicular to the media facing surface.

Assignees

• HGST Netherlands BV

Inventors

• Etoh Kimitoshi
• Sugiura Kenji
• Sugiyama Mikito
• Maruyama Yohji
• Hosomi Kazuhiko
• Watanabe Katsuro

Classifications

• G11B5/3116 Primary

  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) · CPC title

• G11B5/39 Primary

  using magneto-resistive devices {or effects} · CPC title

• 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 · CPC title

• G11B5/3906 Primary

  Details related to the use of magnetic thin film layers or to their effects · CPC title

• G11B5/315

  Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads · CPC title