Driving force for commensurate vortex domain formation in periodic pinning arrays
Driving force for commensurate vortex domain formation in periodic pinning arrays
Recent vortex images in periodic pinning arrays have revealed the formation of degenerate commensurate domains separated by domain walls near rational fractional filling. This phenomenon was entirely unanticipated since, in stark contrast to ferromagnetic materials, the energies and magnetisation of different domains are identical, and the driving force for domain formation and estimation of typical domain sizes has, until now, remained an unsolved problem. We use high-resolution scanning Hall probe microscopy to show that domain formation is driven by the efficient incorporation of mismatched excess vortices/vacancies at the corners of domain walls. Molecular dynamics simulations with a generic pinning potential reveal that domains are only formed when vortex–vortex interactions are long range. A semi-quantitative model of domain formation further discloses how domain sizes depend on both the pinning array period and effective penetration depth.
author keywords, superconducting vortices, pinning arrays, commmensurate states
50-55
Bending, S.J.
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Grigorenko, A.N.
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Van Bael,, M.J.
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Lange, M.
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Moschalkov, V.V.
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Fangohr, H.
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de Groot, P.A.J.
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2004
Bending, S.J.
6fc9500c-53af-4abc-9a27-b0c4e4f87712
Grigorenko, A.N.
4d52c563-5acc-4a8d-b8e1-7e8dbcb2edf2
Van Bael,, M.J.
a10e5631-81b9-452d-a911-c059799381fd
Lange, M.
09bc39bc-5524-4826-8079-22ae450a4965
Moschalkov, V.V.
23e8d828-6c33-4e22-a354-741dd96d6de1
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Bending, S.J., Grigorenko, A.N., Van Bael,, M.J., Lange, M., Moschalkov, V.V., Fangohr, H. and de Groot, P.A.J.
(2004)
Driving force for commensurate vortex domain formation in periodic pinning arrays.
Physica C: Superconductivity and its Applications, 404 (1-4), .
(doi:10.1016/j.physc.2003.11.055).
Abstract
Recent vortex images in periodic pinning arrays have revealed the formation of degenerate commensurate domains separated by domain walls near rational fractional filling. This phenomenon was entirely unanticipated since, in stark contrast to ferromagnetic materials, the energies and magnetisation of different domains are identical, and the driving force for domain formation and estimation of typical domain sizes has, until now, remained an unsolved problem. We use high-resolution scanning Hall probe microscopy to show that domain formation is driven by the efficient incorporation of mismatched excess vortices/vacancies at the corners of domain walls. Molecular dynamics simulations with a generic pinning potential reveal that domains are only formed when vortex–vortex interactions are long range. A semi-quantitative model of domain formation further discloses how domain sizes depend on both the pinning array period and effective penetration depth.
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Published date: 2004
Keywords:
author keywords, superconducting vortices, pinning arrays, commmensurate states
Identifiers
Local EPrints ID: 57077
URI: http://eprints.soton.ac.uk/id/eprint/57077
ISSN: 0921-4534
PURE UUID: 45bc95cc-8b84-4fff-9ccf-8a8fc3c097a3
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Date deposited: 13 Aug 2008
Last modified: 16 Mar 2024 03:09
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Contributors
Author:
S.J. Bending
Author:
A.N. Grigorenko
Author:
M.J. Van Bael,
Author:
M. Lange
Author:
V.V. Moschalkov
Author:
P.A.J. de Groot
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