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A ferromagnetic oxide semiconductor as spin injection electrode in magnetic tunnel junction

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arxiv cond-mat/0507137 v1 pith:4CFUA2LK submitted 2005-07-06 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords ferromagnetictemperaturebarrierelectrodeinjectionjunctionmagneticsemiconductor
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A magnetic tunnel junctions composed of room temperature ferromagnetic semiconductor rutile Ti1-xCoxO2-d and ferromagnetic metal Fe0.1Co0.9 separated by AlOx barrier showed positive tunneling magnetoresistance (TMR) with a ratio of ~11 % at 15 K, indicating that Ti1-xCoxO2-d can be used as a spin injection electrode. The TMR decreased with increasing temperature and vanished above 180 K. TMR action at high temperature is likely prohibited by the inelastic tunneling conduction due to the low quality of the amorphous barrier layer and/or the junction interface.

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