Abstract
Due to the magneto-optical (MO) activity of light rare earths, NdFeCo alloys have been suggested as candidates for use in future high density MO media designed for use at shorter wavelengths. We have measured the MO indices of refraction and computed the maximum Kerr rotation figure of merit as a function of wavelength from 400 to 900 nm for a wide range of NdFeCo and TbFeCo alloys. Only a marginal gain in MO media performance is expected by incorporating NdFeCo into optimized TbFeCo thin film stacks.
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