Magnetic proximity effects in V/Fe superconductor/ferromagnet single bilayer revealed by waveguide-enhanced polarized neutron reflectometry

Abstract

Polarized neutron reflectometry is used to study the magnetic proximity effect in a superconductor/ferromagnet (SC/FM) system of composition Cu(32nm)/V(40nm)/Fe(1nm)/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(40nm)/Fe(1nm) 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 0.7 TC. manifested in a systematic change in the height and width of the waveguide resonance peak. Upon increasing the temperature from 0.7 TC to TC, a gradual decay of this state is observed, accompanied by a 5% growth of the diffuse scattering. According to theoretical studies, such behavior is the result of the magnetic proximity effect. Due to the presence of the thin FM layer the superconducting electrons are polarized and, as a result, near the SC/FM interface an additional magnetic layer appears in the SC with thickness comparable to ksi, the coherence length of the superconductor.

Submitted to the Journal of Superconductivity and Novel Magnetism. 11 pages, 6 figures.

References in corpus (12)

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• Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit
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• Comment on "Ferromagnetic film on a superconducting substrate"
• Ferromagnetic Film on a Superconducting Substrate
• Inhomogeneous superconductivity induced in a weak ferromagnet
• Magnetic non-collinear neutron wave resonator
• Feasibility of study magnetic proximity effects in bilayer "superconductor/ferromagnet" using waveguide-enhanced Polarized Neutron Reflectometry
• Method to measure neutron beam polarization with 2x1 Neutron Spin Filter

Cited by in corpus (14)

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• Magnetic moment manipulation by triplet Josephson current
• On the feasibility to study inverse proximity effect in a single S/F bilayer by Polarized Neutron Reflectometry
• Magnetic proximity effect in [Nb/Gd] superlattices seen by neutron scattering
• On the Explanation of the Paramagnetic Meissner Effect in Superconductor/Ferromagnet Heterostructures
• Polarized neutron channeling as a tool for the investigations of weakly magnetic thin films
• The inverse proximity effect in strong ferromagnet-superconductor structures
• Magnetic proximity effect at interface between a cuprate superconductor and an oxide spin valve
• Polarized neutron channeling in weakly magnetic films
• Structural, magnetic and superconducting characterization of the CuNi/Nb bilayers of the S/F type using Polarized Neutron Reflectometry and complementary techniques
• Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers
• Peculiarities of neutron waveguides with thin Gd layer
• Divergence of neutron microbeams from planar waveguides
• Density of states in the heterostructure ferromagnetic insulator-superconductor-ferromagnetic insulator