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Domain Structure of Uniaxial Antiferromagnets. The Problem of Nucleation
Author(s) -
Mitsek A. I.,
Gaidanskii P. F.,
Pushkar V. N.
Publication year - 1970
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.19700380104
Subject(s) - nucleation , metastability , domain (mathematical analysis) , condensed matter physics , domain wall (magnetism) , anisotropy , physics , spin (aerodynamics) , displacement (psychology) , field (mathematics) , state (computer science) , magnetic field , mathematics , thermodynamics , quantum mechanics , magnetization , mathematical analysis , psychology , pure mathematics , psychotherapist , algorithm
The dependence of the energy γ 180 and the halfwidth δ 180 of 180° L‐domain walls in antiferromagnets on the magnetic field H is calculated for low fields. At H → H 0 ( H 0 is the critical field of the spin‐flop transition) the walls expand and their energy γ180 decreases. In the spin‐flop region 90° domain structure appears. γ90 and δ 90 are determined by the value of fourth‐order anisotropy constant K 2 . The calculation of the metastable state ( K 2 <0) region shows that its boundaries may be approximated by the astroid at | K 2 | ≪ K 1 only. The wall displacement in the spin‐flop region ( K 2 ≪ 0) and the domain structure at K 2 > 0 are discussed. The problem of the new magnetic phase nucleation is considered.