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Antiferromagnets with Random Anisotropy. Influence of the Dimensionality
Author(s) -
Richter J.,
Skomski R.
Publication year - 1989
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.2221530230
Subject(s) - anisotropy , condensed matter physics , curse of dimensionality , antiferromagnetism , dimension (graph theory) , physics , magnetization , random field , spin (aerodynamics) , statistical physics , magnetic field , mathematics , quantum mechanics , statistics , combinatorics , thermodynamics
The influence of a small random anisotropy on the ground‐state properties of a classical antiferromagnet with an easy z ‐axis in two, three, and four dimensions is discussed. The random anisotropy causes a slightly noncollinear magnetic structue, in which the tipping of the sublattice magnetisations varies over the system. The tipping is largest in two dimensions and decreases rapidly with increasing dimension. The magnetisation‐versus‐field behaviour is strongly influenced by the random anisotropy in the case of fields parallel to the easy z ‐axis and close to the spin‐flop transition for dimensions two and three. A smearing out of the spin‐flop transition is indicated, which is particularly pronounced in two dimensions. The dimension four is the marginal dimension, where the small random anisotropy is almost negligible against the coherent part of anisotropy.