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Phys Rev Lett. 2002 Dec 30;89(27):276601. Epub 2002 Dec 20.

Negative spin polarization of Fe3O4 in magnetite/manganite-based junctions.

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Department of Materials Science & Engineering, Cornell University, Ithaca, NY 14853, USA.


Epitaxial oxide trilayer junctions composed of magnetite (Fe3O4) and doped manganite (La0.7Sr0.3MnO3) exhibit inverse magnetoresistance as large as -25% in fields of 4 kOe. The inverse magnetoresistance confirms the theoretically predicted negative spin polarization of Fe3O4. Transport through the barrier can be understood in terms of hopping transport through localized states that preserve electron spin information. The junction magnetoresistance versus temperature curve exhibits a peak around 60 K that is explained in terms of the paramagnetic to ferrimagnetic transition of the CoCr2O4 barrier.

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