Anomalous Nernst Effect in Epitaxial L10 FePd1-xPtx Alloy Films: Berry Curvature and Thermal Spin Current
Journal
Physical Review Applied
Journal Volume
13
Journal Issue
5
Date Issued
2020
Author(s)
Shi Z., Xu S.-J., Ma L., Zhou S.-M., Guo G.-Y.
Abstract
Anomalous Nernst effect in epitaxially grown L10-ordered FePd1-xPtx 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 Pt composition. By subtracting the Seebeck contribution, the anomalous Nernst conductivity (αxyA) 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 Pt-Pd with large spin-orbit coupling strength. Moreover, the first-principles calculations also predict a large spin Nernst counductivity for both L10-ordered FePd and FePt. Thus, the present results may shed light in searching materials with large thermally driven Hall and spin currents. ? 2020 American Physical Society.
Subjects
Binary alloys; Calculations; Fruits; Heavy metals; Iron alloys; Metallic films; Palladium alloys; Spin orbit coupling; Ternary alloys; Anomalous Hall resistivity; Epitaxially grown; First principles; First-principles calculation; Intrinsic contribution; Nernst coefficients; Spin currents; Thermally driven; Platinum alloys
Type
journal article