1. Electric Dipole Active Magnetic Resonance and Nonreciprocal Directional Dichroism in Magnetoelectric Multiferroic Materials in Terahertz and Millimeter Wave Regions
- Author
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Noriki Terada, Hidekazu Tanaka, Masayuki Hagiwara, Masashige Matsumoto, and Shojiro Kimura
- Subjects
Physics ,Condensed matter physics ,Magnetic dipole transition ,Physics::Optics ,010402 general chemistry ,Coupling (probability) ,01 natural sciences ,Electromagnetic radiation ,Atomic and Molecular Physics, and Optics ,030218 nuclear medicine & medical imaging ,0104 chemical sciences ,Condensed Matter::Materials Science ,03 medical and health sciences ,Dipole ,Polarization density ,0302 clinical medicine ,Electric field ,Condensed Matter::Strongly Correlated Electrons ,Spin (physics) ,Excitation - Abstract
We review electric dipole active magnetic resonance and nonreciprocal directional dichroism in magnetoelectric multiferroic materials in terahertz and millimeter wave regions. Owing to dynamical magnetoelectric coupling generated by the spin-dependent electric polarization, magnetic resonance, which usually occurs owing to magnetic dipole transition, can be induced by the oscillating electric fields of electromagnetic wave. This electric dipole active magnetic resonance can be useful for microscopic investigations of magnetic excitation in unconventional spin systems. The magnetoelectric coupling also induces the nonreciprocal directional dichroism, which provides a novel functionality to materials as an optical diode, in teraheltz and microwave absorption by magnetic resonance. As examples, we describe the results of the high field ESR measurements of the triangular lattice antiferromagnet $$\hbox {CuFeO}_{\mathrm{2}}$$ and the interacting quantum spin dimer systems $$\hbox {TlCuCl}_{\mathrm{3}}$$ and $$\hbox {KCuCl}_{\mathrm{3}}$$ .
- Published
- 2021