Evolution of non-collinear magnetic state of exchange biased ferromagnet/normal metal/ ferromagnet/superconductor heterostructure in magnetic field studied by polarized neutron reflectometry
Yu. Khaydukov1,2,5, R. Morari3, V. Zdravkov3,4, L. Mustafa1, T. Keller1,2, B. Keimer1, and A. Sidorenko3
1Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
2Max Planck Society Outstation at the FRM-II, Garching, Germany
3D. Ghitsu Institute of Electronic Engineering and Nanotechnologies ASM, Kishinev, Moldova
4Institut für Physik, Universität Augsburg, Augsburg, Germany
5Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia
Received January 2, 2017
By using waveguide enhanced polarized neutron reflectometry we have characterized the magnetic state of exchange biased CoOx(20 nm)/Co(4 nm)/Nb(5 nm)/Co(2 nm)/Nb(25 nm)/Al2O3 system. Measurement allowed to determine the dependence of the inclination angles of magnetic moment of the both Co layers as a function of applied field. According to the measurement the soft Co(2 nm) layer magnetization turns towards external field in magnetic fields as small as 20 Oe. In contrast direction of magnetic moment of Co(4 nm) layer can not be altered in magnetic fields as high as 2 kOe.
PACS: 75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures);
Key words: superconductor-ferromagnet, Polarized Neutron Reflectometry, triplet pairing.
Published online: May 25, 2017
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ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)