Thermal fluctuations of magnetic nanoparticles: fifty years after Brown
Citation:
William T. Coffey and Yuri P. Kalmykov, Thermal fluctuations of magnetic nanoparticles: fifty years after Brown, Journal of Applied Physics, 112, 12, 2012Download Item:
Abstract:
The reversal time, superparamagnetic relaxation time, of the magnetization of fine single domain
ferromagnetic nanoparticles owing to thermal fluctuations plays a fundamental role in information
storage, paleomagnetism, biotechnology, etc. Here a comprehensive tutorial-style review of the
achievements of fifty years of development and generalizations of the seminal work of Brown
[Phys. Rev.
130
, 1677 (1963)] on thermal fluctuations of magnetic nanoparticles is presented.
Analytical as well as numerical approaches to the estimation of the damping and temperature
dependence of the reversal time based on Brown?s Fokker-Planck equation for the evolution of the
magnetic moment orientations on the surface of the unit sphere are critically discussed while the
most promising directions for future research are emphasized
Sponsor
Grant Number
European Union (EU)
295196
Author's Homepage:
http://people.tcd.ie/wcoffeyDescription:
PUBLISHED
Author: COFFEY, WILLIAM
Type of material:
Journal ArticleSeries/Report no:
Journal of Applied Physics112
12
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Full text availableKeywords:
KRAMERS PROBLEM, LANGEVIN-DYNAMICS, CUBIC ANISOTROPY, TO-NOISE RATIO, DOMAIN FERROMAGNETIC PARTICLES, FOKKER-PLANCK EQUATION, UNIAXIAL SUPERPARAMAGNETIC PARTICLES, ACTIVATED RATE-PROCESSES, STONER-WOHLFARTH MODELDOI:
http://dx.doi.org/10.1063/1.4754272Metadata
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