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

doi:10.1103/PhysRevLett.111.247203

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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28 Scopus citations

Abstract

We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La_0.7Ca_0.3MnO₃ and insulating cuprate PrBa₂Cu₃O₇. 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.

Original language	English
Article number	247203
Journal	Physical Review Letters
Volume	111
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.111.247203
State	Published - Dec 11 2013
Externally published	Yes

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title = "Emergent spin filter at the interface between ferromagnetic and insulating layered oxides",

abstract = "We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La0.7Ca0.3MnO3 and insulating cuprate PrBa2Cu3O7. 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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AU - Liu, Yaohua

AU - Cuellar, F. A.

AU - Sefrioui, Z.

AU - Freeland, J. W.

AU - Fitzsimmons, M. R.

AU - Leon, C.

AU - Santamaria, J.

AU - Te Velthuis, S. G.E.

PY - 2013/12/11

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N2 - We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La0.7Ca0.3MnO3 and insulating cuprate PrBa2Cu3O7. 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.

AB - We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La0.7Ca0.3MnO3 and insulating cuprate PrBa2Cu3O7. 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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VL - 111

JO - Physical Review Letters

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Emergent spin filter at the interface between ferromagnetic and insulating layered oxides

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