High frequency assisted magnetic recording head and disk device comprising the magnetic recording head

Patent metadata

Field	Value
Publication number	US-9679587-B2
Application number	US-201514945269-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Aug 25, 2015
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

According to one embodiment, a magnetic recording head includes an air-bearing surface, a main magnetic pole, a write shield opposed to the main magnetic pole with a write gap therebetween, a high-frequency oscillator which includes a spin injection layer and a oscillation layer and is provided between the main magnetic pole and the write shield, the oscillation layer and the spin injection layer including a stack surface extending in a direction intersecting with the air-bearing surface, and a magnetic material layer which is provided in at least one of the main magnetic pole and the write shield, faces the high-frequency oscillator, and has negative magnetic anisotropy with respect to a direction intersecting with the stack surfaces of the high-frequency oscillator.

First claim

What is claimed is:

1. A magnetic recording head comprising:
an air-bearing surface;
a main magnetic pole which comprises a distal end portion extending to the air-bearing surface and is configured to produce a recording magnetic field;
a write shield which is opposed to the distal end portion of the main magnetic pole across a write gap;
a high-frequency oscillator which comprises a stacked spin injection layer and a stacked oscillation layer and is provided between the main magnetic pole and the write shield in the write gap, each of the oscillation layer and the spin injection layer comprising a stack surface extending in a direction intersecting with the air-bearing surface; and
a magnetic material layer which is provided in at least one of the main magnetic pole and the write shield, faces the high-frequency oscillator, and has negative magnetic anisotropy with respect to a direction intersecting with the stack surfaces of the high-frequency oscillator.

2. The magnetic recording head of claim 1 , wherein an area of a facing surface of the magnetic material layer facing the oscillation layer is greater than an area of the stack surface of the oscillation layer.

3. The magnetic recording head of claim 2 , wherein a height of the magnetic material layer from the air-bearing surface in a depth direction is greater than a height of the oscillation layer.

4. The magnetic recording head of claim 3 , wherein a film thickness of a portion of the magnetic material layer located above the air-bearing surface in a height direction is greater than a film thickness of a portion of the magnetic material layer located on the air-bearing surface.

5. The magnetic recording head of claim 2 , wherein a width of the magnetic material layer in a track width direction is greater than a width of the oscillation layer in the track width direction.

6. The magnetic recording head of claim 5 , wherein a film thickness of both side portions of the magnetic material layer in the track width direction is greater than a film thickness of a central portion of the magnetic material layer in the track width direction.

7. The magnetic recording head of claim 1 , wherein
a height of the magnetic material layer from the air-bearing surface in a depth direction is greater than a height of the oscillation layer, and
a film thickness of a portion of the magnetic material layer located above the air-bearing surface in a height direction is greater than a film thickness of a portion of the magnetic material layer located on the air-bearing surface.

8. The magnetic recording head of claim 7 , wherein
a width of the magnetic material layer in a track width direction is greater than a width of the oscillation layer in the track width direction, and
a film thickness of both side portions of the magnetic material layer in the track width direction is greater than a film thickness of a central portion of the magnetic material layer in the track width direction.

9. The magnetic recording head of claim 1 , wherein
a width of the magnetic material layer in a track width direction is greater than a width of the oscillation layer in the track width direction, and
a film thickness of both side portions of the magnetic material layer in the track width direction is greater than a film thickness of a central portion of the magnetic material layer in the track width direction.

10. The magnetic recording head of claim 9 , wherein both side portions of the magnetic material layer in the track width direction protrude toward a side of the high-frequency oscillator.

11. The magnetic recording head of claim 1 , wherein
a width of the magnetic material layer in a track width direction is greater than a width of the oscillation layer in the track width direction, and
both side portions of the magnetic material layer in the track width direction protrude toward a side of the high-frequency oscillator.

12. The magnetic recording head of claim 1 , wherein a thickness of an area of the magnetic material layer facing the high-frequency oscillator is less than a thickness of an area other than the area facing the high-frequency oscillator.

13. A disk device comprising:
a disk recording medium comprising a magnetic recording layer; and
the magnetic recording head of claim 1 configured to record information in the recording medium.

14. The disk device of claim 13 , wherein an area of a facing surface of the magnetic material layer facing the oscillation layer is greater than an area of the stack surface of the oscillation layer.

15. The disk device of claim 13 , wherein
a height of the magnetic material layer from the air-bearing surface in a depth direction is greater than a height of the oscillation layer, and
a film thickness of a portion of the magnetic material layer located above the air-bearing surface in a height direction is greater than a film thickness of a portion of the magnetic material layer located on the air-bearing surface.

16. The disk device of claim 13 , wherein
a width of the magnetic material layer in a track width direction is greater than a width of the oscillation layer in the track width direction, and
a film thickness of both side portions of the magnetic material layer in the track width direction is greater than a film thickness of a central portion of the magnetic material layer in the track width direction.

17. The disk device of claim 16 , wherein both side portions of the magnetic material layer in the track width direction protrude toward a side of the high-frequency oscillator.

18. The disk device of claim 13 , wherein a thickness of an area of the magnetic material layer facing the high-frequency oscillator is less than a thickness of an area other than the area facing the high-frequency oscillator.

Assignees

• Toshiba Kk

Inventors

• Taguchi Tomoko
• Koui Katsuhiko

Classifications

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B5/3153

  including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure · CPC title

• G11B5/1278 Primary

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/314

  where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence) · CPC title

• 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 (G11B5/2455, G11B5/265 take precedence) · CPC title