Spin-torque oscillator for microwave assisted magnetic recording

摘要

In a conventional type magnetic head that performs microwave assisted recording, since a difference in a demagnetizing field between an end and the center of a field generation layer (FGL) grows larger when saturation magnetization of the FGL grows larger, the FGL that generates a microwave is not oscillated in a state of a single domain. Then, a spin-torque oscillator according to the present invention used for a magnetic head for microwave assisted recording is provided with at least one fixed layer, one non-magnetic intermediate layer and one alternating-current magnetic field generation layer respectively and is provided with a structure where saturation magnetization at ends of a film except an end in a direction from an air bearing surface to a surface opposite to it is made smaller than saturation magnetization in the center of the film of the alternating-current magnetic field generation layer.

主权项

1. A spin-torque oscillator used for microwave assisted recording, comprising:
at least one fixed layer, one non-magnetic intermediate layer and one alternating-current magnetic field generation layer respectively, wherein saturation magnetization at ends of a film of the alternating-current magnetic field generation layer except an end in a direction from an air hearing surface to a surface opposite to it is smaller than saturation magnetization in the center of a film of the alternating-current magnetic field generation layer.