Emergent electromagnetic induction beyond room temperature

TL;DR

This paper demonstrates large emergent electromagnetic induction at and above room temperature using spin-spiral states in a metallic helimagnet, paving the way for miniaturized quantum inductors.

Contribution

It reports the first observation of room-temperature emergent electromagnetic induction in a metallic helimagnet with controllable inductance sign.

Findings

Achieved large inductance at room temperature.

Inductance sign varies with temperature, magnetic field, and current density.

Potential for microscale quantum inductors.

Abstract

Emergent electromagnetic induction based on electrodynamics of noncollinear spin states may enable dramatic miniaturization of inductor elements widely used in electric circuits, yet many issues are to be solved toward application. One such problem is how to increase working temperature. We report the large emergent electromagnetic induction achieved around and above room temperature based on short-period ($\leq$ 3 nm) spin-spiral states of a metallic helimagnet ${\rm YMn}_{6}{\rm Sn}_{6}$. The observed inductance value $L$ and its sign are observed to vary to a large extent, depending not only on the spin helix structure controlled by temperature and magnetic field but also on the current density. The present finding on room-temperature operation and possible sign control of $L$ may provide a new step toward realizing microscale quantum inductors.