Resonant switching using spin valves

TL;DR

This paper demonstrates a method to reverse magnetization in nanoparticles using an rf field generated by a spin valve, which is excited by a swept current matching the nanoparticle's resonant frequency, enabling fast and stable switching.

Contribution

It introduces a novel resonant switching technique utilizing spin valves to generate rf fields for magnetization reversal in nanoparticles.

Findings

Fast magnetization switching demonstrated.

Switching is stable against small perturbations.

Uses currents comparable to recent experimental values.

Abstract

Using micromagnetics we demonstrate that the r.f. field produced by a spin valve can be used to reverse the magnetization in a magnetic nanoparticle. The r.f. field is generated using a current that specifically excites a uniform spin wave in the spin valve. This current is swept such that the chirped-frequency generated by the valve matches the angular dependent resonant frequency of the anisotropy-dominated magnetic nanoparticle, as a result of which the magnetization reversal occurs. The switching is fast, requires currents similar to those used in recent experiments with spin valves, and is stable with respect to small perturbations. This phenomenon can potentially be employed in magnetic information storage devices or recently discussed magnetic computing schemes.