Pre-assisting microwave-assisted magnetic recording with spin-torque nano-oscillators
AssigneeHeadway Technologies, Inc.
InventorsHaowen Ren, Wenyu Chen, Yuhui Tang
Life of this patent
Estimating the term…
Abstract
The present embodiments relate to a pre-assisting microwave assisted magnetic recording (MAMR) (PA-MAMR) write-head structure where the STO is disposed within a leading shield (LS). The STO can be used to pump energy into the media before the writing process. The STO can also pre-excite the media and let the media oscillation damp over the time and then switch under the writer field. The present embodiments can be easier to increase the magnetic volume and magnetic moment of the free layer, while also achieving a greater oscillation frequency with magnetization oscillations around the axis in the film plane.
Claims20
A write head for a disk drive, the write head comprising:
- a main pole (MP) configured to provide a magnetic flux to a recording medium;
- a trailing shield (TS) comprising a hot seed (HS) to collect a flux from the MP and increase a downtrack gradient;
- two side shields (SS) each disposed adjacent to the MP and configured to confine the flux in a crosstrack direction to increase a crosstrack gradient;
- a leading edge taper (LET) configured to create a taper in a leading side of the MP;
- a leading shield (LS);
- a set of insulator layers disposed within the LET and the LS;
- and
- a spin-torque oscillator (STO) patterned in the LS, wherein the STO includes a free magnetic layer to generate a rf field and a pinned magnetic layer as a spin polarizer, and wherein the set of insulator layers are disposed on opposing sides of the STO and configured to guide a bias current to the STO.
A device comprising:
- a main pole (MP) configured to provide a magnetic flux to a recording medium;
- a leading edge taper (LET) configured to create a taper in a leading side of the MP;
- a leading shield (LS);
- a set of insulator layers disposed within the LET and the LS;
- and
- a spin-torque oscillator (STO) patterned in the LS, wherein the STO includes a free magnetic layer to generate a rf field and a pinned magnetic layer as a spin polarizer, and wherein the set of insulator layers are disposed on opposing sides of the STO and configured to guide a bias current to the STO.
A write head comprising:
- a main pole (MP);
- a trailing shield (TS) comprising a hot seed (HS);
- two side shields (SS) each disposed adjacent to the MP;
- a leading edge taper (LET);
- a leading shield (LS);
- a set of insulator layers disposed within the LET and the LS;
- and
- a spin-torque oscillator (STO) patterned in the LS, wherein the STO includes a free magnetic layer to generate a rf field and a pinned magnetic layer as a spin polarizer, and wherein the set of insulator layers are disposed on opposing sides of the STO and configured to guide a bias current to the STO.
Dependencies are inferred from the claim text.