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Distribution of switching fields in magnetic granular materials

Distribution of switching fields in magnetic granular materials
Distribution of switching fields in magnetic granular materials
We present analytical calculations and kinetic Monte-Carlo modeling of rate-dependent behavior of switching field distributions (SFDs) in an ensemble of Stoner-Wohfarth particles, assuming distributions of anisotropies and volumes, and thermal activation included by the Néel-Brown theory. By applying probabilistic arguments, we show that the SFD can be self-consistently separated into the contribution from distributions of intrinsic properties of particles and the (irreducible) contribution resulting solely from thermal fluctuations, which is shown to become a significant effect at sweep rates relevant to the recording process. This provides a unifying framework for systematic analysis of different classes of systems
0003-6951
182405-182410
Hovorka, O.
a12bd550-ad45-4963-aa26-dd81dd1609ee
Pressesky, J.
5abf78e8-eef8-4ea5-94a9-35d152d32518
Ju, G.
8fc26845-8303-4d7d-aac6-59833d98474a
Berger, A.
4c40c340-bd0b-4ec6-af1e-fd8326110cca
Chantrell, R.W.
2df0bd37-172a-4d0b-892a-2c78b6dc3fc3
Hovorka, O.
a12bd550-ad45-4963-aa26-dd81dd1609ee
Pressesky, J.
5abf78e8-eef8-4ea5-94a9-35d152d32518
Ju, G.
8fc26845-8303-4d7d-aac6-59833d98474a
Berger, A.
4c40c340-bd0b-4ec6-af1e-fd8326110cca
Chantrell, R.W.
2df0bd37-172a-4d0b-892a-2c78b6dc3fc3

Hovorka, O., Pressesky, J., Ju, G., Berger, A. and Chantrell, R.W. (2012) Distribution of switching fields in magnetic granular materials. Applied Physics Letters, 101 (18), 182405-182410. (doi:10.1063/1.4765085).

Record type: Article

Abstract

We present analytical calculations and kinetic Monte-Carlo modeling of rate-dependent behavior of switching field distributions (SFDs) in an ensemble of Stoner-Wohfarth particles, assuming distributions of anisotropies and volumes, and thermal activation included by the Néel-Brown theory. By applying probabilistic arguments, we show that the SFD can be self-consistently separated into the contribution from distributions of intrinsic properties of particles and the (irreducible) contribution resulting solely from thermal fluctuations, which is shown to become a significant effect at sweep rates relevant to the recording process. This provides a unifying framework for systematic analysis of different classes of systems

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Published date: November 2012
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 351907
URI: http://eprints.soton.ac.uk/id/eprint/351907
ISSN: 0003-6951
PURE UUID: 736979e7-0c91-45c9-810e-9ddad653bb32
ORCID for O. Hovorka: ORCID iD orcid.org/0000-0002-6707-4325

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Date deposited: 29 Apr 2013 10:40
Last modified: 15 Mar 2024 03:47

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Contributors

Author: O. Hovorka ORCID iD
Author: J. Pressesky
Author: G. Ju
Author: A. Berger
Author: R.W. Chantrell

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