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

Author:

Lei MingORCID,Coh Sinisa

Abstract

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 the σ x y ( ω ) we find a strong dependence of σ xy on ω in the terahertz range. For example, we find that below 10 THz Co3Al has nearly constant σ xy and that above 10 THz it is reduced by about 50 times. Furthermore, we find a strong dependence of σ xy on the chemical composition. For example, we find that the addition of Al to Fe changes the sign of σ xy , while the addition of Co to Fe leads to a nonmonotonic dependence of σ xy on Co concentration.

Funder

NSF

Publisher

IOP Publishing

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