High spin-torque efficiency spin-torque oscillator (STO) with dual spin polarization layer
First Claim
1. A microwave-assisted magnetic recording (MAMR) head, comprising:
- a main magnetic pole;
a spin-torque oscillator (STO) positioned near the main magnetic pole, the STO comprising;
a first perpendicular magnetic layer positioned above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer (SPL 1) having an axis of magnetic anisotropy in a direction of film thickness that is perpendicular to a film surface;
a first non-magnetic transmission layer (spacer layer 1) positioned above and directly adjacent the first perpendicular magnetic layer;
a magnetic layer effectively having a plane of easy magnetization in the film surface positioned above and directly adjacent the first non-magnetic transmission layer, the magnetic layer being a field generation layer (FGL);
a second non-magnetic transmission layer (spacer layer 2) positioned above and directly adjacent the magnetic layer; and
a second perpendicular magnetic layer positioned above and directly adjacent the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer (SPL 2) having magnetic anisotropy in the direction of film thickness that is perpendicular to the film surface,wherein one of the first and second perpendicular magnetic layers is configured to undergo T-mode oscillations with the FGL, andwherein another of the first and second perpendicular magnetic layers is configured to undergo U-mode oscillations with the FGL.
6 Assignments
0 Petitions
Accused Products
Abstract
In one embodiment, a MAMR head includes a main magnetic pole, a STO positioned near the main magnetic pole, the STO including a first perpendicular magnetic layer positioned above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer having an axis of magnetic anisotropy in a direction perpendicular to a film surface, a first non-magnetic transmission layer positioned above the first perpendicular magnetic layer, a magnetic layer effectively having a plane of easy magnetization in the film surface positioned above the first non-magnetic transmission layer, the magnetic layer being a FGL, a second non-magnetic transmission layer positioned above the magnetic layer, and a second perpendicular magnetic layer positioned above the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer having magnetic anisotropy in the direction perpendicular to the film plane.
38 Citations
20 Claims
-
1. A microwave-assisted magnetic recording (MAMR) head, comprising:
-
a main magnetic pole; a spin-torque oscillator (STO) positioned near the main magnetic pole, the STO comprising; a first perpendicular magnetic layer positioned above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer (SPL 1) having an axis of magnetic anisotropy in a direction of film thickness that is perpendicular to a film surface; a first non-magnetic transmission layer (spacer layer 1) positioned above and directly adjacent the first perpendicular magnetic layer; a magnetic layer effectively having a plane of easy magnetization in the film surface positioned above and directly adjacent the first non-magnetic transmission layer, the magnetic layer being a field generation layer (FGL); a second non-magnetic transmission layer (spacer layer 2) positioned above and directly adjacent the magnetic layer; and a second perpendicular magnetic layer positioned above and directly adjacent the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer (SPL 2) having magnetic anisotropy in the direction of film thickness that is perpendicular to the film surface, wherein one of the first and second perpendicular magnetic layers is configured to undergo T-mode oscillations with the FGL, and wherein another of the first and second perpendicular magnetic layers is configured to undergo U-mode oscillations with the FGL. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for forming a microwave-assisted magnetic recording (MAMR) head, the method comprising:
-
forming a main magnetic pole above a substrate; forming a first perpendicular magnetic layer above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer (SPL 1) having an axis of magnetic anisotropy in a direction of film thickness that is perpendicular to a film surface; forming a first non-magnetic transmission layer (spacer layer 1) above and directly adjacent the first perpendicular magnetic layer; forming a magnetic layer above and directly adjacent the first non-magnetic transmission layer, the magnetic layer being a field generation layer (FGL) and effectively having a plane of easy magnetization in the film surface; forming a second non-magnetic transmission layer (spacer layer 2) above and directly adjacent the magnetic layer; and forming a second perpendicular magnetic layer above and directly adjacent the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer (SPL 2) having magnetic anisotropy in the direction of film thickness that is perpendicular to the film surface, wherein one of the first and second perpendicular magnetic layers is configured to undergo T-mode oscillations with the FGL, and wherein another of the first and second perpendicular magnetic layers is configured to undergo U-mode oscillations with the FGL. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification