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  • 1.
    Nagy, Bela
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering. Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    Merkel, D. G.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    Jakab, L.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    Fuzi, J.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    Veres, T.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    Bottyan, L.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
    4-bounce neutron polarizer for reflectometry applications2018In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 89, no 5, article id 056105Article in journal (Refereed)
    Abstract [en]

    A neutron polarizer using four successive reflections on m = 2.5 supermirrors was built and installed at the GINA neutron reflectometer at the Budapest Neutron Centre. This simple setup exhibits 99.6% polarizing efficiency with 80% transmitted intensity of the selected polarization state. Due to the geometry, the higher harmonics in the incident beam are filtered out, while the optical axis of the beam remains intact for easy mounting and dismounting the device in an existing experimental setup. Published by AIP Publishing.

  • 2.
    Nagy, Bela
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering. Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary.
    Khaydukov, Yu.
    Max-Planck Institute for Solid State Research, Stuttgart, Germany / Max Planck Society Outstation at FRM-II, Garching, Germany / Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia.
    Efremov, D.
    Max Planck Institute Solid State Research, Germany / Leibniz Institute Solid State and Mat Research Dresden, Germany.
    Vasenko, A. S.
    National Research University Higher School of Economics, Moscow, Russia.
    Mustafa, L.
    Max-Planck Institute for Solid State Research, Stuttgart, Germany.
    Kim, J. -H.
    Max Planck Institute Solid State Research, Germany.
    Keller, T.
    Max Planck Institute Solid State Research, Germany / Max Planck Soc Outstn FRM II, Germany.
    Zhernenkov, K.
    Ruhr University of Bochum, Germany.
    Devishvili, A.
    Ruhr University of Bochum, Germany / Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden.
    Steitz, R.
    Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany.
    Keimer, B.
    Max Planck Institute Solid State Research, Germany.
    Bottyan, L.
    Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary.
    On the explanation of the paramagnetic Meissner effect in superconductor/ferromagnet heterostructures2016In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 116, no 1, article id 17005Article in journal (Refereed)
    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.

  • 3.
    Khaydukov, Yu. N.
    et al.
    Moscow State University, Moscow, Russia / Joint Institute for Nuclear Research, Dubna, Russia.
    Aksenov, V. L.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Nikitenko, Yu. V.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Zhernenkov, K. N.
    Joint Institute for Nuclear Research, Dubna, Russia / Ruhr-Universität Bochum, Bochum, Germany.
    Nagy, Bela
    KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary.
    Teichert, A.
    Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany / Instituut voor Kern-en Stralings fysica and INPA, CLeuven, Belgium.
    Steitz, R.
    Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany.
    Rühm, A.
    Max-Planck-Institut für Metallforschung, Stuttgart, Germany.
    Bottyán, L.
    KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary.
    Magnetic Proximity Effects in V/Fe Superconductor/Ferromagnet Single Bilayer Revealed by Waveguide-Enhanced Polarized Neutron Reflectometry2011In: Journal of Superconductivity and Novel Magnetism, ISSN 1557-1939, E-ISSN 1557-1947, Vol. 24, no 1-2, p. 961-968Article in journal (Refereed)
    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.

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