Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-12
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Total 7 pages,with Supplemental Material. Accepted for publication in Physical Review Letters
Scientific paper
We examine the anomalous inverse spin switch behavior in La$_{0.7}$Ca$_{0.3}$MnO$_3$ (LCMO)/YBa$_2$Cu$_3$O$_{7-\delta}$ (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.
Fitzsimmons M. R.
Hoffmann Achim
Leon Carlos
Liu Yaohua
Nemes Norbert M.
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