Abstract
AbstractIn amorphous ferromagnets spatially fluctuating exchange interaction give rise to a critical behaviour substantially different from crystalline magnets. Within the framework of a molecular field theoretical approach, a non‐local Landau‐Ginzburg equation is applied for thin amorphous film in the vicinity of phase transition point by means of a correlated molecular field, which can only vary on larger scale than the spin correlation length. Therefore, the manner how the structural disorder affects the critical behaviour changes with temperature. The calculation of the hyperfine field distribution measured in the Mössbauer experiment is done for the case of a binary alloy with simple cubic lattice. Numerical results for various surface parameters and temperatures are obtained.
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