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Magnetic Proximity Effects in V/Fe Superconductor/Ferromagnet Single Bilayer Revealed by Waveguide-Enhanced Polarized Neutron Reflectometry
Moscow State University, Moscow, Russia / Joint Institute for Nuclear Research, Dubna, Russia.
Joint Institute for Nuclear Research, Dubna, Russia.
Joint Institute for Nuclear Research, Dubna, Russia.
Joint Institute for Nuclear Research, Dubna, Russia / Ruhr-Universität Bochum, Bochum, Germany.
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2011 (English)In: Journal of Superconductivity and Novel Magnetism, ISSN 1557-1939, E-ISSN 1557-1947, Vol. 24, no 1-2, p. 961-968Article in journal (Refereed) Published
Abstract [en]

Polarized neutron reflectometry is used to study the magnetic proximity effect in a superconductor/ferromagnet (SC/FM) system of composition Cu(32 nm)/ V(40 nm)/Fe(1 nm)/MgO. In contrast to previous studies, here a single SC/FM bilayer, is studied and multilayer artefacts are excluded. The necessary signal enhancement is achieved by waveguide resonance, i.e., preparing the V(40 nm)/Fe(1 nm) SC/FM bilayer sandwiched by the highly reflective MgO substrate and Cu top layer, respectively. A new magnetic state of the system was observed at temperatures below 0.7TC manifested in a systematic change in the height and width of the waveguide resonance peak. Upon increasing the temperature from 0.7TC to TC, a gradual decay of this state is observed, accompanied by a 5% growth of the diffuse scattering. This behavior can be explained in a natural way by the polarization of the superconducting electrons upon the SC transition, i.e., an appearance of additional induced magnetization within the SC, due to the proximity of the FM layer.

Place, publisher, year, edition, pages
Springer, 2011. Vol. 24, no 1-2, p. 961-968
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-155784DOI: 10.1007/s10948-010-1041-0OAI: oai:DiVA.org:liu-155784DiVA, id: diva2:1299352
Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-28Bibliographically approved

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Nagy, Bela
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