Magnetic proximity effect at the interface between a cuprate superconductor and an oxide spin valve
Journal article, 2016

A heterostructure that consists of the YBa2Cu3O7-delta cuprate superconductor and the SrRuO3/La0.7Sr0.3MnO3 ruthenate/manganite spin valve is investigated using SQUID magnetometry, ferromagnetic resonance, and neutron reflectometry. It is shown that a magnetic moment is induced due to the magnetic proximity effect in the superconducting part of the heterostructure, while the magnetic moment in the composite ferromagnetic interlayer is suppressed. The magnetization emerging in the superconductor coincides in order of magnitude with the results of calculations taking into account the induced magnetic moment of Cu atoms because of orbital reconstruction at the interface between the superconductor and the ferromagnet, as well as with the results of the model taking into account the variations in the density of states at a distance on the order of the coherence length in the superconductor. The experimentally obtained characteristic penetration depth of the magnetic moment in the superconductor considerably exceeds the coherence length of the cuprate superconductor, which indicates the predominance of the mechanism of induced magnetic moment of Cu atoms.

Author

Gennady Ovsyannikov

Chalmers, Microtechnology and Nanoscience (MC2)

V. V. Demidov

National Research University of Electronic Technology (MIET)

Y. N. Khaydukov

Max Planck Institute

Moscow State University

L. Mustafa

Max Planck Institute

K. Y. Constantinian

National Research University of Electronic Technology (MIET)

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Dag Winkler

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Journal of Experimental and Theoretical Physics

1063-7761 (ISSN) 1090-6509 (eISSN)

Vol. 122 4 738-747

Subject Categories

Fusion, Plasma and Space Physics

DOI

10.1134/s1063776116040063

More information

Latest update

6/12/2018