Spatially resolved observation of uniform precession modes in spin-valve systems

TL;DR

This study uses time-resolved photoemission electron microscopy to observe uniform precession modes in spin-valve systems, revealing coupling-dependent frequencies and resonant excitation capabilities.

Contribution

It provides the first detailed spatially resolved observation of uniform precession modes in spin-valve systems and demonstrates their excitation control via frequency tuning.

Findings

Precession frequencies depend on coupling strength.

Uniform precession modes can be resonantly excited.

Macrospin model explains the frequency dependence.

Abstract

Using time-resolved photoemission electron microscopy the excitation of uniform precession modes in individual domains of a weakly coupled spin-valve system has been studied. A coupling dependence of the precession frequencies has been found that can be reasonably well understood on the basis of a macrospin model. By tuning the frequency of the excitation source the uniform precession modes are excited in a resonant way.