Spin-dependent Seebeck and Nernst effects in an ideal skyrmion gas

Zadorozhnyi, Andrei; Dahnovsky, Yuri

doi:10.1016/j.jmmm.2020.167367

Spin-dependent Seebeck and Nernst effects in an ideal skyrmion gas

Journal Article · Fri Sep 17 00:00:00 EDT 2021 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2020.167367· OSTI ID:1781048

Zadorozhnyi, Andrei ^[1]; Dahnovsky, Yuri ^[2]

Univ. of Wyoming, Laramie, WY (United States); University of Wyoming
Univ. of Wyoming, Laramie, WY (United States)

In this work, we theoretically and numerically study spin-dependent Seebeck and Nernst effects in 2D ferromagnetic materials with the topological spin texture (skyrmion and vortex) ideal gas. From the numerical solution of the matrix Boltzmann equation for a nonequilibrium distribution function and the Lippmann–Schwinger equation for a T-matrix we find the strong nonlinear behaviors in the thermoelectric coefficients depending on skyrmion/vortex diameters and electron concentrations. In particular, the dramatic dependences in the Seebeck and Nernst coefficients take place at larger magnetic texture sizes where the abrupt sign flip in the vortex Seebeck and Nernst coefficients occurs in the narrow region of electron concentrations. In this case the normalized Nernst coefficient changes from +5 to -7. The spin-dependent thermoelectric coefficients are proportional to T at low temperatures for all skyrmion/vortex sizes.

Research Organization:: Univ. of Wyoming, Laramie, WY (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: SC0020074

OSTI ID:: 1781048

Alternate ID(s):: OSTI ID: 1780407

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 518; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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