Research Papers in Physics and Astronomy
Title
Relaxation in magnetic nanostructures
Document Type
Article
Date of this Version
May 2005
Abstract
The damping of magnetization processes in nanostructures is investigated by Fokker–Planck-type model calculations and quantum-mechanical considerations based on Fermi's golden rule. In the absence of energy barriers, the problem reduces to a magnetic diffusion equation with a particle-size-dependent diffusivity which is indirectly proportional to the relaxation-time parameter τo. For small particles, the relaxation time is proportional to the particle volume, but when the particle size reaches a few nanometers, it approaches a constant bulk value.
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Comments
Published by American Institute of Physics. J. Applied Physics 97, 10A702 (2005). ©2005 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.