Abstract
We have synthesized and characterized epitaxial magnetite (Fe3O4) heterostructures that have been grown by pulsed laser deposition. Trilayers of magnetite, separated by a paramagnetic insulating CoCr2O4 layer, exhibit two distinct coercive fields corresponding to the two magnetite layers. However, detailed magnetic measurements indicate that the two magnetite layers are exchange coupled across CoCr2O4 layers as thick as 10 nm. Current-voltage characteristics in a range of temperatures show nonlinear behavior reminiscent of junction behavior. Magnetoresistance and its temperature dependence are characteristic of a single magnetic layer.
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Chopdekar, R.V., Hu, G., Ford, A.C. et al. Magnetics and magnetoresistance in epitaxial magnetite heterostructures. J. Electron. Mater. 33, 1254–1258 (2004). https://doi.org/10.1007/s11664-004-0149-z
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DOI: https://doi.org/10.1007/s11664-004-0149-z