Microwave spectroscopy on magnetization reversal dynamics of nanomagnets with electronic detection

TL;DR

This paper introduces a microwave spectroscopy detection method using anisotropic magnetoresistance to study magnetization reversal and domain-wall dynamics in nanomagnets, providing insights into resonant behaviors.

Contribution

The paper presents a novel electronic detection technique for microwave spectroscopy of nanomagnet dynamics, enabling detailed study of domain-wall resonance and reversal processes.

Findings

Resonant enhancement of magnetization reversal by microwave magnetic fields.

Detection of single domain-wall resonance.

Role of domain-wall dynamics in magnetization reversal.

Abstract

We demonstrate a detection method for microwave spectroscopy on magnetization reversal dynamics of nanomagnets. Measurement of the nanomagnet anisotropic magnetoresistance was used for probing how magnetization reversal is resonantly enhanced by microwave magnetic fields. We used Co strips of 2 um x 130 nm x 40 nm, and microwave fields were applied via an on-chip coplanar wave guide. The method was applied for demonstrating single domain-wall resonance, and studying the role of resonant domain-wall dynamics in magnetization reversal.