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arXiv · 1307.5475

Emergent Spin-Filter at the interface between Ferromagnetic and Insulating Layered Oxides

Yaohua Liu·F. A. Cuellar·Z. Sefrioui·J. W. Freeland·M. R. Fitzsimmons·C. Leon·J. Santamaria·S. G. E. te Velthuis
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Abstract

We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La$_{0.7}$Ca$_{0.3}$MnO$_{3}$ and insulating cuprate PrBa$_{2}$Cu$_{3}$O$_{7}$. Contrary to the typically observed steady increase of the tunnel magnetoresistance with decreasing temperature, this system exhibits a sudden anomalous decrease at low temperatures. Interestingly, this anomalous behavior can be attributed to the competition between the positive spin polarization of the manganite contacts and the negative spin-filter effect from the interface-induced Cu magnetization.

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Yaohua Liu, F. A. Cuellar, Z. Sefrioui, J. W. Freeland, M. R. Fitzsimmons, C. Leon, J. Santamaria, S. G. E. te Velthuis. 2013-12-04. Emergent Spin-Filter at the interface between Ferromagnetic and Insulating Layered Oxides. https://doi.org/10.1103/physrevlett.111.247203

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