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Curie temperature and short‐range atomic order in amorphous ferromagnets
Author(s) -
Maksymowicz A. Z.
Publication year - 1982
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.2221140115
Subject(s) - curie temperature , ferromagnetism , condensed matter physics , amorphous solid , atmospheric temperature range , curie constant , curie's law , ising model , curie , coordination number , curie–weiss law , amorphous metal , order (exchange) , chemistry , materials science , thermodynamics , physics , crystallography , ion , organic chemistry , finance , economics
A simple description of amorphous A c B 1– c alloys with different coordination numbers of the components of the alloy, Z A = Z B , is discussed. Curie temperature is calculated and mean field approximation results are compared with those obtained by a Green function technique for the Ising model with S = 1/2. The chemical short range order is accounted for and its parameter is calculated for the equilibrium state at temperature T . Fluctuations of coordination numbers and exchange integrals are not considered to get a more clear picture on how the Curie temperature is affected by Z A ≠ Z B . For a diluted ferromagnet with Z B of nonmagnetic atoms smaller than Z A , the Curie temperature increases and the critical concentration for magnetic solution is shifted to lower values. Short range atomic order, which favours A–B pairs, shows opposite tendency.