Critical current and linewidth reduction in spin-torque nano-oscillators by delayed self-injection

Published

June 15, 2015

Author(s)

Guru S. Khalsa, Mark D. Stiles, Julie Grollier

Abstract

Based on theoretical models, the dynamics of spin torque nano-oscillators can be substantially modified by re-injecting the emitted signal to the input of the oscillator after some delay. Numerical simulations for vortex magnetic tunnel junctions show that this approach can decrease critical currents as much as 25 % and linewidths by a factor of 4 for reasonable parameters. Analytical calculations, which agree well with simulations, demonstrate that these results can be generalized to any kind of spin torque oscillator.

Citation

Applied Physics Letters

Volume

106

Issue

24

Pub Type

Journals

Download Paper

https://doi.org/10.1063/1.4922740

Keywords

Spin-torque, Spin-transfer torque, oscillator, nano-oscillator, spin-torque oscillator, linewidth reduction, auto-oscillator, vortex, magnetics, magnetization dynamics

Citation

Khalsa, G. , Stiles, M. and Grollier, J. (2015), Critical current and linewidth reduction in spin-torque nano-oscillators by delayed self-injection, Applied Physics Letters, [online], https://doi.org/10.1063/1.4922740 (Accessed October 13, 2025)