Microwave Magneto-Chiral Effect in a Noncentro-symmetric Magnet CuB2O4

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.

12 pages, 7 figures

References in corpus (3)

• Spin-polarization coupling in multiferroic transition-metal oxides
• Four-coloured Spin-wave Excitations in Multiferroic Materials
• Magnetoelectric Resonances and Predicted Microwave Diode Effect of Skyrmion Crystal in Multiferroic Chiral-Lattice Magnet

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• Microwave directional dichroism resonant with spin excitations in the polar ferromagnet GaV${}_4$S${}_8$
• Lattice and magnetic dynamics in polar chiral incommensurate antiferromagnet Ni${}_2$InSbO${}_6$
• Fingerprints of spin-current physics on magnetoelectric response in the spin-$1/2$ magnet Ba${}_2$CuGe${}_2$O${}_7$
• Terahertz optical activity near crystal field transitions of Tm3+ ions in magnetoelectric alumoborates