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Influence of Structure Fluctuations on the Curie Temperature and Susceptibility of Amorphous Ferromagnets
Author(s) -
Schreiber J.,
Kobe S.,
Handrich K.,
Richter 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.2220700228
Subject(s) - curie temperature , condensed matter physics , ferromagnetism , ising model , curie constant , amorphous solid , heisenberg model , physics , coupling constant , spin (aerodynamics) , curie–weiss law , chemistry , quantum mechanics , thermodynamics , organic chemistry
Abstract Within the stochastical lattice model of amorphous Heisenberg and Ising ferromagnets the influence is investigated of fluctuations of exchange integrals on the Curie temperature T c for different spin values and numbers of nearest neighbours using the constant coupling approximation and a high temperature expansion for the susceptibility χ. T C and χ are always reduced by the fluctuations of the exchange integrals within the Heisenberg model for any spin and within the Ising model for S = 1/2 (for S ≧ 1 the situation is more complicated). The structure fluctuations lead to two opposite effects: 1. weakening of magnetic long range order and 2. increase of magnetic clustering (short range order).