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A study of structurally disordered single‐element magnetic materials beyond the homogeneous molecular field approximation
Author(s) -
Šlechta J.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220670222
Subject(s) - spins , condensed matter physics , amorphous solid , curie temperature , homogeneous , physics , magnetic field , magnetization , mean field theory , curie , materials science , statistical physics , quantum mechanics , chemistry , ferromagnetism , crystallography
A usual assumption in the theory of amorphous magnetic materials is 〈S i 〉 = S. It is shown that in amorphous materials this is a very crude approximation. The magnetic properties of small random clusters of localised spins were studied beyond the above simplification. It is found that in this case the fluctuations of the exchange interaction around its crystalline mean value cause an increase of the Curie temperature. In the light of this conclusion most of the experimental results in this direction should be reinterpreted. It is argued that the magnetic properties inherently depend on higher spatial correlations than pair–pair ones.