Investigation of magneto-structural phase transition in FeRh by reflectivity and transmittance measurements in visible and near-infrared spectral region

Investigation of magneto-structural phase transition in FeRh by reflectivity and transmittance measurements in visible and near-infrared spectral region

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Magneto-structural phase transition in FeRh epitaxial layers was studied optically.It is shown that the transition between the low-temperature antiferromagnetic phase and the high-temperature ferromagnetic phase is accompanied by a rather large change of the optical response in the visible and near-infrared spectral ranges.This change is consistent with Cradle mount ab initio calculations of reflectivity and transmittance.Phase transition temperatures in a series of FeRh films with thicknesses ranging from Walking Poles 6 to 100 nm is measured thereby demonstrating the utility of the method to quickly characterise samples.Spatially resolved imaging of their magnetic properties with a micrometer resolution shows that the phase transition occurs at different temperatures in different parts of the sample.