High frequency operation of a spin-torque oscillator at low field

Detection of spin torque magnetization dynamics through low frequency noise

Nanowire spin torque oscillator driven by spin orbit torques.

Spin torque from spin current applied to a nanoscale region of a ferromagnet can act as negative magnetic damping and thereby excite self-oscillations of its magnetization. In contrast, spin torque uniformly applied to the magnetization of an extended ferromagnetic film does not generate self-oscillatory magnetic dynamics but leads to reduction of the saturation magnetization. Here we report st...

Images of a spin-torque-driven magnetic nano-oscillator.

We present the first space- and time-resolved images of the spin-torque-induced steady-state oscillation of a magnetic vortex in a spin-valve nanostructure. We find that the vortex structure in a nanopillar is considerably more complicated than the 2D idealized structure often-assumed, which has important implications for the driving efficiency. The sense of the vortex gyration is uniquely dete...

Micromagnetic simulation of high-power spin-torque oscillator in half- metallic Heusler alloy spin valve nanopillar

Concept of a Bias-Field-Free Spin-Torque Oscillator Based on Two MgO-MTJs

We propose a novel spin-torque oscillator based on two MgO-MTJs with a shared free layer. By performing extensive micromagnetic modeling we found that the structure exhibits a wide tunability of oscillation frequencies from a few GHz to several ten GHz.