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On the explanation of the paramagnetic Meissner effect in superconductor/ferromagnet heterostructures
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering. Hungarian Academic Science, Hungary.
Max Planck Institute Solid State Research, Germany; Max Planck Soc Outstn FRM II, Germany; Moscow MV Lomonosov State University, Russia.
Max Planck Institute Solid State Research, Germany; Leibniz Institute Solid State and Mat Research Dresden, Germany.
National Research University, Russia.
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2016 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 116, no 1, article id 17005Article in journal (Refereed) Published
Abstract [en]

An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40 nm)/F (F = Fe(1, 3 nm), Co(3 nm), Ni(3 nm)) was observed using SQUID magnetometry upon cooling below the superconducting transition temperature TC in magnetic fields of 10 Oe to 50 Oe applied parallel to the sample surface. A similar increase, often called the paramagnetic Meissner effect (PME), was observed before in various superconductors and superconductor/ferromagnet systems. To explain the PME effect in the presented S/F bilayers a model based on a row of vortices located at the S/F interface is proposed. According to the model the magnetic moment induced below TC consists of the paramagnetic contribution of the vortex cores and the diamagnetic contribution of the vortex-free region of the S layer. Since the thickness of the S layer is found to be 3-4 times less than the magnetic-field penetration depth, this latter diamagnetic contribution is negligible. The model correctly accounts for the sign, the approximate magnitude and the field dependence of the paramagnetic and the Meissner contributions of the induced magnetic moment upon passing the superconducting transition of a ferromagnet/superconductor bilayer. Copyright (C) EPLA, 2016.

Place, publisher, year, edition, pages
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY , 2016. Vol. 116, no 1, article id 17005
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-133277DOI: 10.1209/0295-5075/116/17005ISI: 000388369100023OAI: oai:DiVA.org:liu-133277DiVA, id: diva2:1057470
Note

Funding Agencies|DFG Collaborative Research Center [TRR 80]; RFBR [14-22-01007, 14-22-01063]; BMBF [05KN7PC1, 05K10PC1]; Swedish Research Council; Basic Research Program at the National Research University Higher School of Economics (HSE) [T3-97]

Available from: 2016-12-18 Created: 2016-12-15 Last updated: 2017-11-29

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