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

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 o...

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Bibliographic Details
Published in:arXiv.org 2013-12
Main Authors: Liu, Yaohua, Cuellar, F A, Sefrioui, Z, Freeland, J W, Fitzsimmons, M R, Leon, C, Santamaria, J, S G E te Velthuis
Format: Article
Language:English
Subjects:
Ferromagnetism
Magnetic properties
Magnetization
Magnetoresistance
Magnetoresistivity
Manganites
Polarization (spin alignment)
Transport properties
Tunnel junctions
Tunnel magnetoresistance
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1307.5475