Anomalous Nernst Effect in Epitaxial <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>L</mml:mi><mml:msub><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msub><mml:mspace width="0.2em"/><mml:msub><mml:mrow><mml:mi>Fe</mml:mi><mml:mi>Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:math> Alloy Films: Berry Curvature and Thermal Spin Current
Zhong Shi, Shijie Xu, Li Ma, Shi-Ming Zhou, Guang‐Yu Guo
Abstract
Anomalous Nernst effect in epitaxially grown $L{1}_{0}$-ordered $\mathrm{Fe}\mathrm{Pd}{}_{1\ensuremath{-}x}\mathrm{Pt}{}_{x}$ alloy films is systematically investigated both experimentally and theoretically. It is found that the anomalous Nernst coefficient and anomalous Hall resistivity both increase monotonically with the increase of $\mathrm{Pt}$ composition. By subtracting the Seebeck contribution, the anomalous Nernst conductivity (${\ensuremath{\alpha}}_{xy}^{A}$) is obtained. By comparison with first-principles Berry-phase-theory calculations, it is interesting to find that the anomalous Nernst conductivity is dominated by the intrinsic contribution from heavy metal $\mathrm{Pt}$-$\mathrm{Pd}$ with large spin-orbit coupling strength. Moreover, the first-principles calculations also predict a large spin Nernst counductivity for both $L{1}_{0}$-ordered $\mathrm{Fe}\mathrm{Pd}$ and $\mathrm{Fe}\mathrm{Pt}$. Thus, the present results may shed light in searching materials with large thermally driven Hall and spin currents.