Negative Spin Polarization of Fe3O4 in Magnetite/Manganite-Based Junctions

G. Hu and Y. Suzuki
Phys. Rev. Lett. 89, 276601 – Published 20 December 2002

Abstract

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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  • Received 8 April 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.276601

©2002 American Physical Society

Authors & Affiliations

G. Hu and Y. Suzuki

  • Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853

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Issue

Vol. 89, Iss. 27 — 30 December 2002

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