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A new approach to the theory of single domain TRM
Author(s) -
Smith Guy M.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i003p00201
Subject(s) - statistical physics , domain (mathematical analysis) , thermal , statistical mechanics , physics , thermal fluctuations , statistical theory , energy (signal processing) , mechanics , classical mechanics , mathematics , mathematical analysis , thermodynamics , statistics , quantum mechanics
While the theory of single domain TRM has been very successful in describing qualitative behavior, it has been less so quantitatively. It is argued here that at least some of the discrepancy between theory and experiment derives from inadequacies in the theory. An analysis of the conventional dynamical model used in TRM theory in terms of the statistical mechanics of thermal fluctuations shows that it is internally inconsistent. Calculation of the distribution of thermal energy shows that, counter to the usual assumption, only a small fraction of the energy goes into producing uniform rotation of magnetization, suggesting that non‐uniform modes are more likely to be the controlling factor in TRM. One possible non‐uniform mode is suggested: reversal by passage of a domain wall through the grain.