| Issue |
Europhys. Lett.
Volume 48, Number 5, December 1999
|
|
|---|---|---|
| Page(s) | 486 - 490 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i1999-00509-0 | |
| 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
Received:
10
May
1999
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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