Low-Field Colossal Magnetoresistance in Manganite Tunnel Junctions
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ABSTRACTLarge magnetoresistance values are obtained on tunnel junctions epitaxially deposited by pulsed-laser deposition and consisting of ferromagnetic manganite La0.67Sr0.33MnO3 electrodes separated by various tunnel barriers: SrTiO3, PrBaCu2.8Ga0.2O7 and CeO2. The magnetoresistance can be decomposed into a low-field and a high-field contribution. The latter is attributed to the presence of canted interfacial manganite phases, as confirmed by the temperature behaviour of the resistance. A low-field magnetoresistance ratio of 450% below 100 Oe is obtained on a sample with a SrTiO3 barrier, indicating a spin polarization value in excess of 0.83 for the manganite.
2008 ◽
Vol 53
(9(5))
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pp. 2427-2430
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1971 ◽
Vol 93
(17)
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pp. 4310-4312
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2011 ◽
Vol 287-290
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pp. 2248-2251