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Thermally Activated Domain Wall Movement in Nickel‐Iron Films
Author(s) -
Craik D. J.,
Wood M. J.
Publication year - 1968
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.19680280142
Subject(s) - permalloy , materials science , magnetization , condensed matter physics , viscosity , field (mathematics) , nickel , domain wall (magnetism) , simple (philosophy) , thermal , movement (music) , magnetic field , nuclear magnetic resonance , thermodynamics , composite material , metallurgy , physics , mathematics , acoustics , quantum mechanics , philosophy , epistemology , pure mathematics
The slow movement of domain walls under a steady field, due to thermal activation, has been observed in a permalloy film, and a quantitative study made over the temperature range ‐39 to +77 ° C. Unlike results obtained previously in another film [8], these do not conform to the simple theory. The theory is extended to include switching by a sinusoidal field, and the ac coercivities are correlated with the dc results. It is suggested that magnetic viscosity should be more pronounced in films with high magnetization dispersions. Some criticisms of the simple theory are advanced. An estimate of the frequency factor C is made from the results on both films, which is higher than theoretical predictions.