Microwave Magneto-Chiral Effect in a Noncentro-symmetric Magnet CuB2O4
Y. Nii, R. Sasaki, Y. Iguchi, and Y. Onose
TL;DR
This study investigates microwave nonreciprocity in a noncentro-symmetric magnet CuB2O4, revealing distinct classical magnetic dipolar and magneto-chiral effects, with the latter linked to chiral transitions and magnetoelectric interactions.
Contribution
It demonstrates the coexistence of magnetic dipolar and magneto-chiral effects in microwave nonreciprocity and highlights the role of magnetoelectric coupling in the MCh effect.
Findings
Identification of classical magnetic dipolar and MCh effects
Observation of chiral transitions via MCh signals
Magnetoelectric effect's essential role in MCh emergence
Abstract
We have investigated microwave nonreciprocity in a noncentro-symmetric magnet CuB2O4. We simultaneously observed differently originated nonreciprocities; the classical magnetic dipolar effect and the magneto-chiral (MCh) effect. By rotating magnetic field in a tetragonal plane, we clearly unveil qualitative difference between them. The MCh effect signal reveals chiral transitions from one enantiomer to the other via intermediate achiral state. We show magnetoelectric effect plays an essential role for the emergence of microwave MCh effect.
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