Doping control of magnetism and emergent electromagnetic induction in high-temperature helimagnets

Abstract

Ac current-driven motions of spiral spin textures can give rise to emergent electric fields acting on conduction electrons. This in turn leads to the emergent electromagnetic induction effect which may realize quantum inductor elements of micrometer size. ${\mathrm{YMn}}_6{\mathrm{Sn}}_6$ is a helimagnet with a short helical period (2-3 nm) that shows this type of emergent inductance beyond room temperature. To identify the optimized materials conditions for ${\mathrm{YMn}}_6{\mathrm{Sn}}_6$-type room-temperature emergent inductors, we have investigated emergent electromagnetic inductance (EEMI) as the magnetism is modified through systematic partial substitution of Y by Tb. By small angle neutron scattering and inductance measurements, we have revealed that the pinning effect on the spin-helix translational mode by Tb doping selectively and largely suppresses the negative component of EEMI, while sustaining the positive inductance arising from the spin tilting mode. We also find that in addition to the spin helix, even the spin-collinear antiferromagnetic structure can host the positive EEMI due to thermally enhanced spin fluctuations. The present study highlights the facile control of both the magnitude and sign of EEMI beyond room temperature, and thus suggests a route to expand the range of emergent inductor candidate materials.

20 pages, 13 figures

References in corpus (5)

• Topological magnon bands in a room temperature Kagome magnet
• Emergent electromagnetic induction beyond room temperature
• Chiral properties of the zero-field spiral state and field-induced magnetic phases of the itinerant kagome metal YMn${}_6$Sn${}_6$
• Electromagnetic response in spiral magnets and emergent inductance
• Intrinsic and extrinsic tunability of Rashba spin-orbit coupled emergent inductors

Cited by in corpus (8)

• Magnetoelectric control of spin helicity and nonreciprocal charge transport in a multiferroic metal
• Energetic perspective on emergent inductance exhibited by magnetic textures in the pinned regime
• Symmetry of the emergent inductance tensor exhibited by magnetic textures
• Reconsidering the nonlinear emergent inductance: time-varying Joule heating and its impact on the AC electrical response
• Emergent inductors in non-helical magnets
• Observation of anisotropic magneto-inductance effect
• Emergent impedance due to antiferromagnetic domain wall dynamics
• Magnons in the fan phase of anisotropic frustrated antiferromagnets