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

• US 9,679,587 B2
• Filed: 11/18/2015
• Issued: 06/13/2017
• Est. Priority Date: 08/25/2015
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Taguchi, Tomoko, Koui, Katsuhiko
• Primary Examiner(s): Renner, Craig A.
• Application Number:
  US14/945,269
• Publication Number:
  US 20170061995A1
• Time in Patent Office: 573 Days
• Field of Search: None
• CPC Class Codes: G11B 2005/0024 Microwave assisted recording
• CPC Class Codes: G11B 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/235 Selection of material for gap filler G11B5/232 takes precedence
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence
• CPC Class Codes: G11B 5/3153 including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure
• CPC Class Codes: G11B 5/3176 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; composite magnetic head structures, e.g. "Metal-In-Gap" heads are classified in G11B5/127 or G11B5/187 and subgroups

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.

Claims

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.