Intrinsic and extrinsic tunability of Rashba spin-orbit coupled emergent inductors

The emergent induction of spiral magnets that was proposed [N. Nagaosa, Jpn. J. Appl. Phys. 58, 120909 (2019)] and recently demonstrated [T. Yokouchi et al., Nature (London) 586, 232 (2020)] is shown to be further extended by a comprehensive treatment of the Rashba spin-orbit coupling and the electron spin relaxation that affect the underlying processes of spin-transfer torque and spinmotive force. Within adiabatic approximation, we show that the output voltages are widely altered intrinsically via the Rashba effect whereas extrinsically via the nonadiabatic correction due to the spin relaxation and sample disorder. The findings respectively clarify the origins for the amplitude modulation and sign change of the emergent inductance with tunability by electrical gating and careful sample preparation.

Automated summary

The emergent induction of spiral magnets is further extended by considering the Rashba spin-orbit coupling and electron spin relaxation effects. Output voltages are intrinsically altered via the Rashba effect and extrinsically via nonadiabatic corrections due to spin relaxation and sample disorder. Controlling the amplitude modulation and sign change of the emergent inductance is possible through electrical gating and careful sample preparation, clarifying their origins.