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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:518

Article

Zadorozhnyi, Andrei¹  Dahnovsky, Yuri¹ 

[1] Univ Wyoming, Dept Phys & Astron 3905, 1000 E Univ Ave, Laramie, WY 82071 USA

关键词: Skyrmions;    Topological spin Hall effect;    Topological spin Seebeck and Nernst effects;   

DOI  :  10.1016/j.jmmm.2020.167367

来源: Elsevier

【 摘 要 】

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 Tmatrix 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 Tat low temperatures for all skyrmion/vortex sizes.

【 授权许可】

Free