Patent ID: 8929031
Filing Date: 2015-01-06
Classification: B82Y,G11B,H01F,H01L,Y10T

Abstract:
1. A spin torque oscillator comprising: an oscillation layer comprising a magnetic material; a spin injection layer comprising a magnetic material and configured to inject a spin into the oscillation layer; and a current confinement layer consisting of an insulating portion comprising an oxide or a nitride and a single conductive portion comprising a nonmagnetic metal and penetrating the insulating portion in a direction of stacking, wherein the conductive portion of the current confinement layer has a rectangular planar shape, and a device region including the oscillation layer and the spin injection layer has a rectangular planar shape in a size of 50 nm×50 nm or less, and wherein the conductive portion of the current confinement layer is positioned near a central portion of a plane of the device region including the oscillation layer and the spin injection layer, and the insulating portion is between each of three sides of the conductive portion and a corresponding one of four sides of the device region, and a fourth side of the conductive portion is at one of the four sides of the device region without the insulating portion being between the fourth side of the conductive region and the one of the four sides of the device region.