NDLI: Fast switching of magnetic nanoparticles: simulation of thermal noise effects using the Langevin dynamics

Content Provider	IEEE Xplore Digital Library
Author	Berkov, D.V.
Copyright Year	1965
Abstract	The most straightforward method to simulate fast switching in magnetic systems is the solution of stochastic equations of motion for magnetic moments (Langevin dynamics), where thermal fluctuations are taken into account by the thermal (random) field H/sup fl/. In this paper, we address first an important methodical problem of this formalism: the choice of the stochastic calculus (Ito or Stratonovich). We prove that both Ito and Stratonovich stochastic integrals give identical results, despite the multiplicative noise present in the stochastic Landau-Lifshitz-Gilbert equation. Discussing correlation properties of H/sup fl/ (which is usually assumed to be /spl delta/ correlated both in space and time), we point out that finite correlation time and radius of this field can be due not only to physical reasons (heat-bath correlations), but can also arise from the finite-element representation of the continuous problem. Afterwards, we present simulation results concerning the influence of thermal fluctuations on the fast switching of magnetic nanoelements. We consider three typical situations: (1) thermal noise influence on the switching which would happen also in the absence of thermal fluctuations (thermally assisted switching); (2) thermally induced switching of the metastable states; and (3) changing of the switching mode as the consequence of thermal fluctuations.
Sponsorship	IEEE Magnetics Society
Starting Page	2489
Ending Page	2495
Page Count	7
File Size	322616
File Format	PDF
ISSN	00189464
Volume Number	38
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic switching Nanoparticles Magnetic noise Stochastic resonance Fluctuations Indium tin oxide Integral equations Space heating Stochastic systems Magnetic moments
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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