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Theory of bloch wall tunnelling
Author(s) -
Egami T.
Publication year - 1973
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.2220570121
Subject(s) - quantum tunnelling , domain wall (magnetism) , condensed matter physics , domain (mathematical analysis) , physics , rectangular potential barrier , liquid helium , quantum mechanics , magnetization , helium , magnetic field , mathematics , mathematical analysis
Abstract The quantum mechanical tunnelling of a very narrow Bloch wall through the intrinsic barrier is considered. A microscopic theory of the spin wave description of narrow domain walls is developed and subsequently extended to describe the domain wall tunnelling phenomena. The tunnelling probability is presented in two ways, firstly, by the quasi‐particle approach using the conventional W.K.B. approximation and secondly by the method of direct product of state vectors. These two methods are complementary to each other. The results indicate that below the temperature of liquid helium the domain wall diffusion in the rare earth metals and compounds which exhibit high intrinsic coercivity is likely to be governed by the tunnelling process.