Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers
J. Stahn, J. Chakhalian, C. Niedermayer, J. Hoppler, T. Gutberlet, J., Voigt, F. Treubel, H.-U. Habermeier, G. Cristiani, B. Keimer, C. Bernhard
TL;DR
This study investigates the magnetic proximity effect in YBa2Cu3O7/La2/3Ca1/3MnO3 multilayers using neutron reflectometry, revealing complex magnetic profiles and interactions between superconducting and ferromagnetic layers.
Contribution
It provides experimental evidence of magnetic profiles and the inverse proximity effect in SC/FM multilayers, highlighting the interplay between superconductivity and ferromagnetism.
Findings
Detection of a structurally forbidden Bragg peak indicating magnetic differences
Identification of possible antiparallel magnetization within the SC layer
Observation of SC-induced enhancement of off-specular reflection
Abstract
superconducting/ferromagnetic (SC/FM) multilayers have been studied by neutron reflectometry. Evidence for a characteristic difference between the structural and magnetic depth profiles is obtained from the occurrence of a structurally forbidden Bragg peak in the FM state. The comparison with simulated reflectivity curves allows us to identify two possible magnetization profiles: a sizable magnetic moment within the SC layer antiparallel to the one in the FM layer (inverse proximity effect), or a ``dead'' region in the FM layer with zero net magnetic moment. The former scenario is supported by an anomalous SC-induced enhancement of the off-specular reflection, which testifies to a strong mutual interaction of SC and FM order parameters.
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