Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

He, Bin; Şahin, Cüneyt; Boona, Stephen R.; Sales, Brian C.; Pan, Yu; Felser, Claudia; Flatté, Michael E.; Heremans, Joseph P.

doi:10.1016/j.joule.2021.08.007

Title: Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

Journal Article · 14 September 2021 · Joule

DOI: https://doi.org/10.1016/j.joule.2021.08.007 · OSTI ID:2471394

He, Bin ^[1];

^[2];

^[3]; Sales, Brian C. ^[4]; Pan, Yu ^[5]; Felser, Claudia ^[5];

^[2];

^[3]

Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); The Ohio State University, Columbus, OH (United States)
University of Chicago, Chicago, IL (United States); University of Iowa, Iowa City, IA (United States)
The Ohio State University, Columbus, OH (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)

Thermoelectric modules are a promising approach to energy harvesting and efficient cooling. In addition to the longitudinal Seebeck effect, transverse devices utilizing the anomalous Nernst effect (ANE) have recently attracted interest. For high conversion efficiency, it is required that the material have a large ANE thermoelectric power and low electrical resistance, which lead to the conductivity of the ANE. ANE is usually explained in terms of intrinsic contributions from Berry curvature. Our observations suggest that extrinsic contributions also matter. Studying single-crystal manganese-bismuth (MnBi), we find a high ANE thermopower (~10 μV/K) under 0.6 T at 80 K, and a transverse thermoelectric conductivity of over 40 A/Km. With insight from theoretical calculations, we attribute this large ANE predominantly to a new advective magnon contribution arising from magnon-electron spin-angular momentum transfer. We propose that introducing a large spin-orbit coupling into ferromagnetic materials may enhance the ANE through the extrinsic contribution of magnons.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: European Union; European Union’s Horizon 2020 research and innovation program; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2471394

Journal Information:: Joule, Journal Name: Joule Journal Issue: 11 Vol. 5; ISSN 2542-4351

Publisher:: Elsevier - Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

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