Abstract
Measurements of the waiting time for the magnetization jump to occur in an isolated single-domain particle as a function of the applied field are reported. The investigations were performed on a single crystal of barium ferrite of about 2.5- mu m size. The data are analyzed using the theory of thermally activated processes. It is found that the activation volume is considerably smaller than the volume of the whole particle.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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