Switching spin valves using r.f. currents

TL;DR

This paper demonstrates that using radio-frequency (r.f.) currents, especially chirped or optimized pulse sequences, can significantly accelerate magnetization reversal in spin-injection devices while reducing the required current magnitude.

Contribution

It introduces novel r.f. pulse schemes, including chirped and digitized pulses, for faster and more efficient switching in spin valves compared to traditional d.c. currents.

Findings

Chirped r.f. pulses enable faster switching.

Optimized pulse sequences reduce current requirements.

Sinusoidal r.f. pulses also facilitate switching.

Abstract

We show that magnetization reversal in spin-injection devices can be significantly faster when using a chirped r.f. rather than d.c current pulse. Alternatively one can use a simple sinusoidal r.f. pulse or an optimized series of alternating, equal-amplitude, square pulses of varying width (a digitized approximation to a chirped r.f. pulse) to produce switching using much smaller currents than with a d.c. pulse.