Emergent spin filter at the interface between ferromagnetic and insulating layered oxides
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2013
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American Physical Society
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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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© 2013 American Physical Society. Work at Argonne National Laboratory and use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357. Work at UCM was supported by the Spanish MICINN through Grant No. MAT2011- 27470-C02, Consolider Ingenio 2010 - CSD2009-00013 (Imagine), and by CAM through Grant No. S2009/MAT- 1756 (Phama). This work has benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the 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.