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Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers

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arxiv cond-mat/0408311 v1 pith:VRBIKEIO submitted 2004-08-13 cond-mat.supr-con cond-mat.str-el

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
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G. Cristiani B. Keimer C. Bernhard
This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords magneticlayereffectmomentmultilayersprofilesproximityallows
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abstract

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

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