Microwave assisted magnetic recording head with spin torque oscillator corner angle relationship, head gimbal assembly, and magnetic recording device

Patent metadata

Field	Value
Publication number	US-9824701-B2
Application number	US-201615138486-A
Country	US
Kind code	B2
Filing date	Apr 26, 2016
Priority date	Apr 26, 2016
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A microwave assisted magnetic head includes a main magnetic pole; a trailing shield; and a spin torque oscillator provided between the main magnetic pole and the trailing shield. The spin torque oscillator has a first end surface configuring a part of an air bearing surface, a second end surface facing the main magnetic pole, and a third end surface facing the first end surface, the first angle θ1 made by the first end surface and the second end surface is smaller than the second angle θ2 formed by the second end surface and the third end surface, and the second angle θ2 is 80 to 100 degrees.

First claim

The invention claimed is:

1. A microwave assisted magnetic head, comprising:
a main magnetic pole generating a recording magnetic field applied to a magnetic recording medium from an end surface configuring a part of an air bearing surface facing the magnetic recording medium;
a trailing shield forming a magnetic guide with the main magnetic pole; and
a spin torque oscillator provided between the main magnetic pole and the trailing shield and generating a microwave magnetic field applied to the magnetic recording medium in a superimposed manner on the recording magnetic field, wherein
the spin torque oscillator has a first end surface configuring a part of the air bearing surface, a second end surface facing the main magnetic pole, and a third end surface on an opposite side of the spin torque oscillator from the first end surface,
a first angle θ1 formed by the first end surface and the second end surface is smaller than a second angle θ2 formed by the second end surface and the third end surface, and
the second angle θ2 is a non-orthogonal angle from 80 to 100 degrees.

2. The microwave assisted magnetic head according to claim 1 , wherein
the second angle θ2 is 80 to less than 90 degrees.

3. The microwave assisted magnetic head according to claim 1 , wherein
the first angle θ1 is greater than or equal to 50 degrees and less than 80 degrees.

4. A head gimbal assembly, comprising:
the microwave assisted magnetic head according to claim 1 ; and
a suspension supporting the microwave assisted magnetic head.

5. A magnetic recording device, comprising:
a magnetic recording medium;
the microwave assisted magnetic head according to claim 1 ; and
a positioning device supporting and positioning the microwave assisted magnetic head with respect to the magnetic recording medium.

6. The microwave assisted magnetic head according to claim 1 , wherein
the spin torque oscillator contacts both the main magnetic pole and the trailing shield.

7. The microwave assisted magnetic head according to claim 1 ,
wherein
the spin torque oscillator is a stacked layer comprising:
an under layer,
a spin injection layer,
a non-magnetic spacer layer,
a magnetic field generation layer, and
a cap layer.

8. The microwave assisted magnetic head according to claim 7 , wherein
the under layer, the spin injection layer, the non-magnetic spacer layer, the magnetic field generation layer, and the cap layer are stacked in that order.

9. The microwave assisted magnetic head according to claim 7 , wherein
the under layer comprises either at least one simple metal, or an alloy of two or more metals selected from a group of: tantalum (Ta), vanadium (V), titanium (Ti), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), and copper (Cu).

10. The microwave assisted magnetic head according to claim 7 , wherein
the thickness of the under layer is between 0.8 nm and 3 nm.

11. The microwave assisted magnetic head according to claim 7 , wherein
the cap layer comprises ruthenium Ru.

12. The microwave assisted magnetic head according to claim 7 , wherein
the cap layer has a thickness of between 0.4 nm and 20 nm.

Assignees

• Tdk Corp

Inventors

• Tang Zhenyao
• Roppongi Tetsuya
• Soeno Yoshikazu
• Matsuzawa Hironobu
• Takahashi Hirokazu

Classifications

• G11B5/235

  Selection of material for gap filler {(G11B5/232 takes precedence)} · 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

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B5/1278 Primary

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

• G11B5/3146

  magnetic layers · CPC title