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Thermal switching field distribution of a single domain particle for field-dependent attempt frequency

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7 Author(s)
Breth, L. ; Health and Environment Department, AIT-Austrian Institute of Technology, 1220 Vienna, Austria ; Suess, D. ; Vogler, C. ; Bergmair, B.
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We present an analytical derivation of the switching field distribution (SFD) at finite temperature for a single domain particle from the Néel-Brown model in the presence of a linearly swept magnetic field. By considering the field dependence of the attempt frequency f0 in the rate equation, we find enhancement of coercivity compared to models using constant f0. The contribution of thermal fluctuations to the standard deviation of the switching field HC derived here reaches values of 10% HC. Considering this contribution, which has been neglected in previous work, is important for the correct interpretation of measurements of switching field distributions.

Published in:

Journal of Applied Physics  (Volume:112 ,  Issue: 2 )