Manipulating chiral-spin transport in a room-temperature multiferroic

A collective excitation of the spin structure in a magnetic insulator can transmit spin-angular momentum with negligible dissipation. Here, we report the experimental observation of chiral-spin transport in multiferroic BiFeO3, where the spin transport is controlled by reversing the ferroelectric polarization and resultant chirality. The ferroelectrically controlled chiral magnons produce an unprecedented ratio of up to 40% rectification at room temperature. Utilizing these controllable chiral magnons in BiFeO3, an all-oxide, energy-scalable logic is demonstrated composed of spin-orbit injection, detection, and magnetoelectric control. This observation opens a new chapter of multiferroic magnons.