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Thermally activated domain wall motion and coercive field in materials with extremely narrow domain walls
Author(s) -
Fähnle M.,
Kronmüller H.,
Barbara B.
Publication year - 1979
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.2220960136
Subject(s) - domain wall (magnetism) , coercivity , domain (mathematical analysis) , materials science , condensed matter physics , field (mathematics) , magnetic domain , displacement (psychology) , motion (physics) , physics , magnetic field , classical mechanics , magnetization , psychology , mathematical analysis , mathematics , quantum mechanics , psychotherapist , pure mathematics
By computer simulation the shapes and energies of displacement nuclei are calculated for thermally activated domain wall motion in materials with so‐called ferroelectric, i.e. monoatomic domain walls. The energies of the critical nuclei decrease with increasing magnetic field, H , however, a simple 1/ H ‐law is only obtained for very small values of H . Thermally activated domain wall motion only occurs at high values of H . It is shown that the intrinsic coercive field H c corresponding to the critical field for the movement of domain walls in multi‐domain particles is appreciably lowered by thermal instabilities.