Abstract
Temperature and compositional dependences of magnetization rare earth (RE=Gd, Tb, Dy, Nd)-Co sputtered films are analysed using the mean field theory, and the sublattice magnetic moments MCo and MRE are calculated as a function of composition. The Kerr rotation angle θK is measured at room temperature in a range of optical wavelenghs from 400 nm to 670 nm. The compositional variation of θK can be described by a model in which two sublattice magnetic moments contribute to θK independent of each other in an additive or a subtractive fashion: K(Co)MCo±K(RE)MRE. The value of K(Co) coincides approximately with that of a pure Co film, whereas K(RE) depends on the RE element significantly.
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