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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure
TT 2.1: Vortrag
Montag, 16. März 2020, 09:30–09:45, HSZ 103
Magnetic proximity effect in Nb/Gd superlattices seen by neutron reflectometry — •Yury Khaydukov1,2,3, Evgeny Kravstov4,5, Vladimir Zhaketov6, Vyacheslav Progliado4, Gideok Kim1, Yury Nikitenko6, Thomas Keller1,2, Vladimir Ustinov4,5, Viktor Aksenov6, and Bernhard Keimer1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany — 2Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), D-85748 Garching, Germany — 3Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, Russia — 4Institute of Metal Physics, Ekaterinburg 620180, Russia — 5Ural Federal University, Ekaterinburg 620002, Russia — 6Joint Institute for Nuclear Research, Dubna 141980, Russia
We used polarized neutron reflectometry to investigate the magnetization profile of superlattices composed of ferromagnetic Gd and superconducting Nb layers [1]. Below the superconducting (S) transition of the Nb layers we observed a partial suppression of ferromagnetic (F) order of Gd layers in [Gd(dF)/Nb(25nm)]12 superlattices. The amplitude of the suppression decreases with increasing dF. By analyzing the neutron data we conclude that the observed effect has an electromagnetic origin - the proximity-coupled S layers screen out the external magnetic field and thus suppress the F response of the Gd layers. Our investigation demonstrates significance of electromagnetic effects, and potential of elemental S/F multilayers as simple model systems for ferromagnetic superconductors.
[1] Khaydukov et al., Phys. Rev. B 99, 140503 (R) (2019)