Magnetic proximity effect at interface between a cuprate superconductor and an oxide spin valve

Abstract

Heterostructures consisting of a cuprate superconductor YBa2Cu3O7x and a ruthenate/manganite (SrRuO3/La0.7Sr0.3MnO3) spin valve have been studied by SQUID magnetometry, ferromagnetic resonances and neutron reflectometry. It was shown that due to the influence of magnetic proximity effect a magnetic moment is induced in the superconducting part of heterostructure and at the same time the magnetic moment is suppressed in the ferromagnetic spin valve. The experimental value of magnetization induced in the superconductor has the same order of magnitude with the calculations based on the induced magnetic moment of Cu atoms due to orbital reconstruction at the superconductor-ferromagnetic interface. It corresponds also to the model that takes into account the change in the density of states at a distance of order of the coherence length in the superconductor. The experimentally obtained characteristic length of penetration of the magnetic moment into superconductor exceeds the coherence length for cuprate superconductor. This fact points on the dominance of the mechanism of the induced magnetic moment of Cu atoms due to orbital reconstruction.

20 pages, 9 figures

References in corpus (7)

• Inverse proximity effect in superconductor-ferromagnet bilayer structures
• Antiferromagnetic coupling and enhanced magnetization in all-ferromagnetic superlattices
• Experimental Observation of the Inverse Proximity Effect in Superconductor/Ferromagnet Layered Structures
• Oscillations of Induced Magnetization in Superconductor-Ferromagnet Heterostructures
• Unconventional proximity effect and inverse spin-switch behavior in a model manganite-cuprate-manganite trilayer system
• Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization
• Magnetic proximity effects in V/Fe superconductor/ferromagnet single bilayer revealed by waveguide-enhanced polarized neutron reflectometry

Cited by in corpus (6)

• Electromagnetic proximity effect in planar superconductor-ferromagnet structures
• Magnetic and Superconducting Phase Diagram of Nb/Gd/Nb trilayers
• Materials challenges for SrRuO3: from conventional to quantum electronics
• Electromagnetic proximity effect controlled by spin-triplet correlations in superconducting spin-valve structures
• On the Explanation of the Paramagnetic Meissner Effect in Superconductor/Ferromagnet Heterostructures
• Magnetism induced by nonlocal spin-entangled electrons in a superconducting spin-valve