Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers

\(\mathrm{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}\) 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...

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Bibliographic Details
Published in:arXiv.org 2004-08
Main Authors: Stahn, J, Chakhalian, J, Niedermayer, C, Hoppler, J, Gutberlet, T, Voigt, J, Treubel, F, H -U Habermeier, Cristiani, G, Keimer, B, Bernhard, C
Format: Article
Language:English
Subjects:
Bragg curve
Ferromagnetism
Magnetic fields
Magnetic moments
Multilayers
Order parameters
Perovskites
Proximity effect (electricity)
Reflectometry
Specular reflection
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Summary:\(\mathrm{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}\) 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.
ISSN:2331-8422
DOI:10.48550/arxiv.0408311