Volume 48, Number 5, December 1999
|Page(s)||486 - 490|
|Published online||01 September 2002|
New integral relaxation time for thermal activation of magnetic particles
Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden, Germany
Accepted: 28 September 1999
The integral relaxation time for the difference of numbers of particles in the two potential wells (IRT-N) for double-well classical spin systems is introduced. For the uniaxial symmetry, it is given by a quadrature. Unlike the previously introduced integral relaxation time for the magnetization, the IRT-N at low temperatures describes the rate of crossing the barrier under all conditions, including the strongly biased case. In the high-barrier case, the new integral relaxation time approaches the inverse of the lowest eigenvalue of the Fokker-Planck equation . It can be more conveniently found by numerical methods than the latter.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 75.50.Tt – Fine-particle systems
© EDP Sciences, 1999
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