Magneto-Electric Coupling in Single Crystal Cu2OSeO3 Studied by a Novel Electron Spin Resonance Technique

TL;DR

This study introduces a novel electron spin resonance technique to investigate magneto-electric coupling in Cu2OSeO3, revealing temperature-dependent and anisotropic coupling strength that correlates with spin susceptibility.

Contribution

The paper presents a new ESR-based method to measure ME coupling and uncovers its temperature dependence and anisotropy in a single crystal of Cu2OSeO3.

Findings

ME coupling strength b3 is temperature dependent

b3 is highly anisotropic

b3(T) correlates with spin susceptibility J(T)

Abstract

The magneto-electric (ME) coupling on spin-wave resonances in single-crystal Cu2OSeO3 was studied by a novel technique using electron spin resonance combined with electric field modulation. An external electric field E induces a magnetic field component \mu_0 H^i = \gamma E along the applied magnetic field H with \gamma=0.7(1) \mu T/(V/mm) at 10 K. We found that ME coupling strength \gamma is temperature dependent and highly anisotropic. \gamma(T) nearly follows that of spin susceptibility J(T) and rapidly decreases above the Curie temperature Tc. The ratio \gamma/J monotonically decreases with increasing temperature without an anomaly at Tc.