Spin torque oscillator having one or more chromium insertion layers for magnetic recording drives
AssigneeWestern Digital Technologies, Inc.
InventorsZheng Gao, Susumu Okamura, James Mac Freitag
Life of this patent
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Abstract
Aspects of the present disclosure relate to spin torque oscillator (STO) and methods, such as spin torque oscillators used in write heads of magnetic media drives. The STO includes a seed layer, a spin polarization layer (SPL), a spacer layer, a field generation layer (FGL), a capping layer. An insertion layer is disposed within the STO. The insertion layer increases the negative Hk. The insertion layer may be located between the FGL and the capping layer, as well as between the FGL and the spacer layer. For a reverse STO, the insertion layer may be disposed between the FGL and the seed layer, as well as between the FGL and the spacer layer.
Claims21
A write head, comprising:
- a main pole;
- a trailing shield;
- and
- a spin torque oscillator (STO) coupled to the main pole and the trailing shield, the STO comprising:
- a seed layer on the main pole;
- a layer on the trailing shield;
- a spin polarizing layer between the seed layer and the layer on the trailing shield;
- a field generating layer between the spin polarizing layer and the layer on the trailing shield;
- a nonmagnetic spacer layer between the spin polarizing layer and the field generating layer;
- and
- a chromium layer disposed on the nonmagnetic spacer layer and between the nonmagnetic spacer layer and the field generating layer.
A spin torque oscillator, comprising:
- a seed layer;
- an end layer;
- a spin polarizing layer between the seed layer and the end layer;
- a field generating layer between the seed layer and the end layer;
- a nonmagnetic spacer layer between the spin polarizing layer and the field generating layer;
- and
- one or more chromium layers comprising a chromium layer disposed on the nonmagnetic spacer layer and between the nonmagnetic spacer layer and the field generating layer, and each of the one or more chromium layers is of a thickness that is up to 40 Angstroms.
A write head, comprising:
- a main pole;
- a trailing shield;
- and
- a spin torque oscillator (STO) coupled to the main pole and the trailing shield, the STO comprising:
- a seed layer on the main pole;
- a layer on the trailing shield;
- a field generating layer between the seed layer and the layer on the trailing shield;
- a spin polarizing layer between the field generating layer and the layer on the trailing shield;
- a nonmagnetic spacer layer between the field generating layer and the spin polarizing layer;
- and
- a chromium layer disposed on the field generating layer and between the field generating layer and the nonmagnetic spacer layer.
A write head, comprising:
- a main pole;
- a trailing shield;
- and
- a spin torque oscillator (STO) coupled to the main pole and the trailing shield, the STO comprising:
- a seed layer on the main pole;
- a layer on the trailing shield;
- a spin polarizing layer between the seed layer and the layer on the trailing shield;
- a field generating layer between the spin polarizing layer and the layer on the trailing shield;
- a spacer layer between the spin polarizing layer and the field generating layer;
- and
- one or more chromium layers between the seed layer and the layer on the trailing shield, the one or more chromium layers comprising:
- a first chromium layer disposed on the field generating layer and between the field generating layer and the layer on the trailing shield, and
- a second chromium layer disposed on the spacer layer and between the spacer layer and the field generating layer.
Dependencies are inferred from the claim text.