title: Magnetochiral dichroism resonant with electromagnons in a helimagnet.
abstract: Cross-coupling between magnetism and electricity in a solid can be hosted by multiferroics with both magnetic and ferroelectric orders. In multiferroics, the collective spin excitations active for both electric and magnetic fields, termed electromagnons, play a crucial role in the elementary process of magnetoelectric (ME) coupling. Here we report the colossal dynamical (optical) ME effect, or more specifically the magnetochiral (MCh) effect, in the electromagnon resonance for the screw spin helimagnet CuFe(1-x)Ga(x)O2 (x = 0.035). The MCh effect shows up as the nonreciprocal directional dichroism; the extinction coefficient is different for counter-propagating lights, as large as by 400%. The MCh effect derived from the screw spin order is proved by control of the magnetic helicity of helimagnetism and its magnetization. The results point to the general presence of the MCh effect in helimagnets, paving a way to the ME control of electromagnetic wave in the giga- to tera-hertz region.
authors: 1] Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan [2].
authors: S
authors: S
authors: Kibayashi
authors: 1] Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan [2] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan [3].
authors: Y
authors: Y
authors: Takahashi
authors: 1] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan [2] PRESTO, Japan Science and Technology Agency, Chiyoda, Tokyo 102-8666, Japan.
authors: S
authors: S
authors: Seki
authors: 1] Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan [2] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
authors: Y
authors: Y
authors: Tokura