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arXiv · 1903.08034

Giant localised spin-Peltier effect due to ultrafast domainwalls motion in antiferromagnetic metals

Rubén M. Otxoa·Unai Atxitia·Pierre E. Roy·Oksana Chubykalo Fesenko
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Abstract

Spin thermo-electric phenomena have attracted wide attention recently, e.g. the Spin Peltier effect (SPE) heat generation by magnonic spin currents. Here we find that the Spin Peltier ef-fect also manifests as a heat wave accompanying fast moving magnetic textures. High speed andextreme magnetic excitation localisation are paramount for efficient transfer of energy from thespin-degrees of freedom to electrons and lattice. While satisfying both conditions is subject to se-vere restrictions in ferromagnets, we find that domain walls in antiferomagnets can overcome theselimitations due to their potential ultrahigh mobility and ultra-small widths originating from the rel-ativistic contraction. To illustrate our findings, we show that electric current driven domain wallmotion in the antiferromagnetic metal Mn2Au can carry a localised heat wave with the maximumamplitude up to 1 K . Since domain walls are well localised nanoscale magnetic objects, this effecthas the potential for nanoscale heating sensing and functionalities.

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Rubén M. Otxoa, Unai Atxitia, Pierre E. Roy, Oksana Chubykalo Fesenko. 2019-03-19. Giant localised spin-Peltier effect due to ultrafast domainwalls motion in antiferromagnetic metals. https://doi.org/10.1038/s42005-020-0296-4

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