Terahertz magneto-optical response in ferromagnetic Fe-Co-Al alloys

Ming Lei; Sinisa Coh

doi:10.1088/1361-648X/ad4226

Terahertz magneto-optical response in ferromagnetic Fe-Co-Al alloys

J Phys Condens Matter. 2024 May 9;36(31). doi: 10.1088/1361-648X/ad4226.

Authors

Ming Lei¹, Sinisa Coh²

Affiliations

¹ Chemical and Environmental Engineering, University of California Riverside, Riverside, CA 92521, United States of America.
² Materials Science and Mechanical Engineering, University of California Riverside, Riverside, CA 92521, United States of America.

PMID: 38653316
DOI: 10.1088/1361-648X/ad4226

Abstract

We study the magneto-optical properties of Fe-Co-Al ordered alloys in the terahertz range of frequencies. Using the standard Kubo-based approach to compute intrinsic part of theσxy(ω)we find a strong dependence ofσ_xyonωin the terahertz range. For example, we find that below 10 THz Co₃Al has nearly constantσ_xyand that above 10 THz it is reduced by about 50 times. Furthermore, we find a strong dependence ofσ_xyon the chemical composition. For example, we find that the addition of Al to Fe changes the sign ofσ_xy, while the addition of Co to Fe leads to a nonmonotonic dependence ofσ_xyon Co concentration.

Keywords: magneto-optical properties; quantum espresso; spin–orbit interaction; terahertz.