Magneto-Electric Coupling in Single Crystal Cu$_2$OSeO$_3$ Studied by a Novel Electron Spin Resonance Technique

ORAL

Abstract

The magneto-electric (ME) coupling on spin-wave resonances in single-crystal Cu$_2$OSeO$_3$ was studied by a novel technique using electron spin resonance combined with electric field modulation. An external electric field ${\bf E}$ induces a magnetic field component $\mu_0 H^i = \gamma E$ along the applied magnetic field ${\bf H}$ with $\gamma=0.7(1)~ \mu$T/(V/mm) at 10 K. The ME coupling strength $\gamma$ is found to be temperature dependent and highly anisotropic. $\gamma(T)$ nearly follows that of the spin susceptibility $J^M(T)$ and rapidly decreases above the Curie temperature $T_{\rm c}$. The ratio $\gamma/J^M$ monotonically decreases with increasing temperature without an anomaly at $T_{\rm c}$.

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Authors

  • Alexander Maisuradze

    Physics Institute, University of Zurich, Zurich, Switzerland

  • Alexander Shengelaya

    Department of Physics, Tbilisi State University, Tbilisi, Georgia

  • Helmuth Berger

    Institutes of Physics of Complex Matter, Ecole Polytechnique Federale de Lausanne(EPFL),CH-1015 Lausanne,Switzerland, Institutes of Physics of Complex Matter, EPFL 1015, Lausanne, Swizerland, Institute of Condensed Matter Physics, EPFL, Lausanne, Switzerland

  • Dejan Djoki\'c

    Institute of Condensed Matter Physics, EPFL, Lausanne, Switzerland

  • Hugo Keller

    Physics Institute - University of Zurich, Physics Institute, University of Zurich, Switzerland, Physik-Institut der Universit\"at Z\"urich, Physics Institute, University of Zurich, Zurich, Switzerland