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

Yaohua Liu, C. Visani, N. M. Nemes, M. R. Fitzsimmons, L. Y. Zhu, J. Tornos, M. Garcia-Hernandez, M. Zhernenkov, A. Hoffmann, C. Leon, J. Santamaria, S. G.E. Te Velthuis

Research output: Contribution to journalArticlepeer-review

Abstract

We examine the anomalous inverse spin switch behavior in La 0.7Ca 0.3MnO 3(LCMO)/YBa 2Cu 3O 7-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.

Original languageEnglish (US)
Article number207205
JournalPhysical review letters
Volume108
Issue number20
DOIs
StatePublished - May 18 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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