Spin-orbit driven ferromagnetic resonance: A nanoscale magnetic characterisation technique

TL;DR

This paper introduces a scalable nanoscale ferromagnetic resonance technique utilizing spin-orbit interaction, enabling detailed magnetic characterization of individual ferromagnetic nanostructures through direct measurement of anisotropy and damping parameters.

Contribution

It presents a novel FMR method driven by spin-orbit interaction, allowing for direct, detailed magnetic analysis of individual nanoscale ferromagnetic structures.

Findings

Measured magnetic anisotropy coefficients and damping parameters for nano-bars.

Identified contributions of Dresselhaus and Rashba spin-orbit interactions.

Demonstrated vector magnetometry of the current-induced driving field.

Abstract

We demonstrate a scalable new ferromagnetic resonance (FMR) technique based on the spin-orbit interaction. An alternating current drives FMR in uniform ferromagnetic structures patterned from the dilute magnetic semiconductors (Ga,Mn)As and (Ga,Mn)(As,P). This allows the direct measurement of magnetic anisotropy coefficients and damping parameters for individual nano-bars. By analysing the ferromagnetic resonance lineshape, we perform vector magnetometry on the current-induced driving field, observing contributions with symmetries of both the Dresselhaus and Rashba spin-orbit interactions.