Abstract
We have observed a magnetic linear dichroism effect for infrared light in ferromagnetic alloys at room temperature. The effect has been studied for ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20},$ ${\mathrm{Ni}}_{80}{\mathrm{Co}}_{20},$ ${\mathrm{Co}}_{90}{\mathrm{Fe}}_{10},$ and ${\mathrm{Fe}}_{88}{\mathrm{V}}_{12}$ thin films by measuring the transmission of light polarized parallel and perpendicular to the magnetization direction. Its physical origin and frequency dependence are explained from a two-current Drude-type model for the conductivity. A study of a single (thin film) specimen is shown to be sufficient for obtaining the spin and angular dependence of electron relaxation times in ferromagnetic alloys.
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