Determination of the infrared complex magneto-conductivity tensor in itinerant ferromagnets from Faraday and Kerr measurements
Abstract
We present measurement and analysis techniques that allow the complete complex magneto-conductivity tensor to be determined from mid-infrared (11-1.6 micron; 100-800 meV) measurements of the complex Faraday (thetaF) and Kerr (thetaK) angles. Since this approach involves measurement of the geometry (orientation axis and ellipticity of the polarization) of transmitted and reflected light, no absolute transmittance or reflectance measurements are required. Thick film transmission and reflection equations are used to convert the complex thetaF and thetaK into the complex longitudinal conductivity sigmaxx and the complex transverse (Hall) conductivity sigmaxy. thetaF and thetaK are measured in a Ga(1-x)MnxAs and SrRuO3 films. The resulting sigmaxx is compared to the values obtained from conventional transmittance and reflectance measurements, as well as the results from Kramers-Kronig analysis of reflectance measurements on similar films.
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