The temperature dependence of the surface magnetization MS(T) in the spin-wave regime is obtained from measurement of the spin polarization of the low-energy cascade electrons. With the T3/2 law, the ratio k of the mean spin deviation in surface and bulk is determined, where k reflects the perpendicular exchange interaction J⊥. In the ferromagnetic glass FeNiB0.5, J⊥ depends critically on the chemistry of the first layer and is weakened even with a bulklike surface composition.
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Mauri et al. (1988) studied this question.
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