Time Domain Mapping of Spin Torque Oscillator Effective Energy

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...

Current driven spin–orbit torque oscillator: ferromagnetic and antiferromagnetic coupling

We consider theoretically the impact of Rashba spin-orbit coupling on spin torque oscillators (STOs) in synthetic ferromagnets and antiferromagnets that have either a bulk multilayer or a thin film structure. The synthetic magnets consist of a fixed polarizing layer and two free magnetic layers that interact through the Ruderman-Kittel-Kasuya-Yosida interaction. We determine analytically which ...

Spin Torque Nano Oscillator for Blueshift and Redshift Detections

Oscillator is the most essential part in the communication, navigation and measurement systems. We propose a spin torque nano oscillator (STNO) which offers the possibility of using the transfer of spin angular momentum via spin polarized current to generate microwave signal. Using this STNO, our simulation result demonstrates that the current dependence of the oscillation frequency changes can...

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