Effect of interface-induced exchange fields on cuprate-manganite spin switches

We examine the anomalous inverse spin switch behavior in La0.7Ca0.3MnO3(LCMO)/YBa2Cu3O7-δ (YBCO)/LCMO trilayers by combined transport studies and polarized neutron reflectometry. Measuring magnetization profiles and magnetoresistance in an in-plane rotating magnetic field, we prove that, contrary to...

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Published in:Physical review letters 2012-05, Vol.108 (20), p.207205-207205, Article 207205
Main Authors: Liu, Yaohua, Visani, C, Nemes, N M, Fitzsimmons, M R, Zhu, L Y, Tornos, J, Garcia-Hernandez, M, Zhernenkov, M, Hoffmann, A, Leon, C, Santamaria, J, te Velthuis, S G E
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cited_by cdi_FETCH-LOGICAL-c386t-19a1604d3ab6a16401f0456bcf9c7f51e4f83c86ab0b76a1d67f20d29bbe548a3
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container_end_page 207205
container_issue 20
container_start_page 207205
container_title Physical review letters
container_volume 108
creator Liu, Yaohua
Visani, C
Nemes, N M
Fitzsimmons, M R
Zhu, L Y
Tornos, J
Garcia-Hernandez, M
Zhernenkov, M
Hoffmann, A
Leon, C
Santamaria, J
te Velthuis, S G E
description We examine the anomalous inverse spin switch behavior in La0.7Ca0.3MnO3(LCMO)/YBa2Cu3O7-δ (YBCO)/LCMO trilayers by combined transport studies and polarized neutron reflectometry. Measuring magnetization profiles and magnetoresistance in an in-plane rotating magnetic field, we prove that, contrary to many accepted theoretical scenarios, the relative orientation between the two LCMO's magnetizations is not sufficient to determine the magnetoresistance. Rather the field dependence of magnetoresistance is explained by the interplay between the applied magnetic field and the (exponential tail of the) induced exchange field in YBCO, the latter originating from the electronic reconstruction at the LCMO/YBCO interfaces.
doi_str_mv 10.1103/PhysRevLett.108.207205
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title Effect of interface-induced exchange fields on cuprate-manganite spin switches
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