Document Type

Article

Publication Date

4-6-2007

Abstract

Hematite films were deposited by magnetron sputtering. A phase transformation from hematite to magnetite occurred when polystyrene PS coated hematite films were annealed above 200 °C in hydrogen flow. Giant negative magnetoresistance MR was observed with the best MR ratio of over 8% at room temperature and in a field of 5.5 T found in samples annealed at 230 °C. The temperature dependence of the resistivity is characteristic of intergranular tunneling. After the PS layer was removed and the films annealed again at 230 °C in hydrogen flow, the resistivity increased by about one order of magnitude and the MR ratio decreased to 4.3%. These data show that PS coating layer can protect magnetite films from oxidation and enhance interganular spin-dependent tunneling magnetoresistance. © 2007 American Institute of Physics.

DOI

10.1063/1.2712031

Comments

Copyright 2007 AIP (American Institute of Physics) Publishing LLC.

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