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Emergent electromagnetic induction based on electrodynamics of noncollinear spin states [1-2] 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 (≤ 3 nm) spin-spiral states of a metallic helimagnet YMn₆Sn₆ [3-4]. 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.

[1] N. Nagaosa, Emergent inductor by spiral magnets. Jpn. J. Appl. Phys. 58, 12090 (2019).

[2]  T. Yokouchi et al. Emergent electromagnetic induction in a helical-spin magnet. Nature 586, 232-236 (2020).

[3]  G. Venturini, D. Fruchart, B. Malaman, Incommensurate magnetic structures of RMn₆Sn₆ (R = Sc, Y, Lu) compounds from neutron diffraction study. J. Alloys Compd. 236, 102-110 (1996).

[4] K. J. Neubauer et al. In-plane magnetic field induced double fan spin structure with c-axis component in metallic kagome antiferromagnet YMn₆Sn₆. Phys. Rev. B 103, 014416 (2021)