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Terahertz magneto-optical response in ferromagnetic Fe-Co-Al alloys
1Chemical and Environmental Engineering, University of California Riverside, Riverside, CA 92521, United States of America.
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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 ofσxyonωin the terahertz range. For example, we find that below 10 THz Co3Al has nearly constantσxyand that above 10 THz it is reduced by about 50 times. Furthermore, we find a strong dependence ofσxyon the chemical composition. For example, we find that the addition of Al to Fe changes the sign ofσxy, while the addition of Co to Fe leads to a nonmonotonic dependence ofσxyon Co concentration.
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