Publication: Effect of interface-induced exchange fields on cuprate-manganite spin switches
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2012-05-18
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American Physical Society
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We examine the anomalous inverse spin switch behavior in La_(0.7)Ca_(0.3)MnO_(3)(LCMO)=YBa_(2)Cu_(3)O_(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.
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© 2012 American Physical Society. Este artículo está firmado por 12 autores. We thank S. Okamoto and J. Salafranca for valuable discussions. Research at Argonne National Laboratory was supported by the U. S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Grant No. DE-AC02- 06CH11357. Work at UCM was supported by Spanish MICINN Grant No. MAT 2011 27470, Consolider Ingenio CSD2009-00013 (IMAGINE), CAM S2009- MAT 1756 (PHAMA). This work has benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the U. S. Department of Energy’s Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE through Contract No. DE-AC52- 06NA25396
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