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Consistent energy barrier distributions in magnetic particle chains

Consistent energy barrier distributions in magnetic particle chains
Consistent energy barrier distributions in magnetic particle chains
We investigate long-time thermal activation behaviour in magnetic particle chains of variable length. Chains are modelled as Stoner–Wohlfarth particles coupled by dipolar interactions. Thermal activation is described as a hopping process over a multidimensional energy landscape using the discrete orientation model limit of the Landau–Lifshitz–Gilbert dynamics. The underlying master equation is solved by diagonalising the associated transition matrix, which allows the evaluation of distributions of time scales of intrinsic thermal activation modes and their energy representation. It is shown that as a result of the interaction dependence of these distributions, increasing the particle chain length can lead to acceleration or deceleration of the overall relaxation process depending on the initialisation procedure.
thermal relaxation, energy barrier distributions, magnetic particle chains, dipolar interaction
0921-4526
1-4
Laslett, O.
26a9ecdf-102d-41f1-8997-0a037fa087f0
Ruta, S.
2b4868a0-a3ed-42cd-8f55-cfcd3ae3095b
Chantrell, R.W.
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Barker, J.
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Friedman, G.
db2affbf-29bf-4a43-8e55-01b388d54c23
Hovorka, O.
a12bd550-ad45-4963-aa26-dd81dd1609ee
Laslett, O.
26a9ecdf-102d-41f1-8997-0a037fa087f0
Ruta, S.
2b4868a0-a3ed-42cd-8f55-cfcd3ae3095b
Chantrell, R.W.
2df0bd37-172a-4d0b-892a-2c78b6dc3fc3
Barker, J.
78f47f76-9d49-45b2-9788-6c667a435c26
Friedman, G.
db2affbf-29bf-4a43-8e55-01b388d54c23
Hovorka, O.
a12bd550-ad45-4963-aa26-dd81dd1609ee

Laslett, O., Ruta, S., Chantrell, R.W., Barker, J., Friedman, G. and Hovorka, O. (2015) Consistent energy barrier distributions in magnetic particle chains. Physica B: Condensed Matter, 1-4. (doi:10.1016/j.physb.2015.09.044).

Record type: Article

Abstract

We investigate long-time thermal activation behaviour in magnetic particle chains of variable length. Chains are modelled as Stoner–Wohlfarth particles coupled by dipolar interactions. Thermal activation is described as a hopping process over a multidimensional energy landscape using the discrete orientation model limit of the Landau–Lifshitz–Gilbert dynamics. The underlying master equation is solved by diagonalising the associated transition matrix, which allows the evaluation of distributions of time scales of intrinsic thermal activation modes and their energy representation. It is shown that as a result of the interaction dependence of these distributions, increasing the particle chain length can lead to acceleration or deceleration of the overall relaxation process depending on the initialisation procedure.

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Accepted/In Press date: 22 September 2015
Published date: 25 September 2015
Keywords: thermal relaxation, energy barrier distributions, magnetic particle chains, dipolar interaction
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 383195
URI: http://eprints.soton.ac.uk/id/eprint/383195
ISSN: 0921-4526
PURE UUID: b6340036-6126-4ada-b399-909c688a6d95
ORCID for O. Hovorka: ORCID iD orcid.org/0000-0002-6707-4325

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Date deposited: 22 Oct 2015 13:50
Last modified: 18 Feb 2021 17:22

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Contributors

Author: O. Laslett
Author: S. Ruta
Author: R.W. Chantrell
Author: J. Barker
Author: G. Friedman
Author: O. Hovorka ORCID iD

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