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We propose an ultrafast way to generate spin chirality and spin current in aclass of multiferroic magnets using a terahertz circularly polarized laser.Using the Floquet formalism for periodically driven systems, we show that it ispossible to dynamically control the Dzyaloshinskii-Moriya interaction inmaterials with magnetoelectric coupling. This is supported by numericalcalculations, by which additional resonant phenomena are found. Specifically,when a static magnetic field is applied in addition to the circularly polarizedlaser, a large resonant enhancement of spin chirality is observed resemblingthe electron spin resonance. Spin current is generated when the laser isspatially modulated by chiral plasmonic structures and could be detected usingoptospintronic devices.

Laser-Driven Multiferroics and Ultrafast Spin Current Generation