A Magnetic Field-to-Digital Converter Employing a Spin-Torque Nano-Oscillator

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...

Wireless current sensing by near field induction from a spin transfer torque nano-oscillator

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...

Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current-field plane for...

Control and Optimization of Coherence of a Nano-sized Spin-torque Microwave Oscillator for Military Nano- Electronics

A theory of generation linewidth of a spin-torque oscillator (STO) based on an in-plane magnetized nanopillar with an anisotropic “free” magnetic layer has been developed. It is shown that the coherent properties of microwave generation strongly depend on the direction and magnitude of the in-plane bias magnetic field. In particular, it is predicted that by choosing the direction of the bias fi...