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High-field magnetoresistance of Fe/GaAs/Fe tunnel junctions

Zenger, M. ; Moser, Jürgen ; Wegscheider, Werner ; Weiss, Dieter ; Dietl, T.


We investigate transport through 6�10 nm thin epitaxial GaAs(001) barriers sandwiched between polycrystalline iron films. Apart from a pronounced tunneling magnetoresistance effect at low magnetic fields, we observe a distinct negative magnetoresistance (MR) at low and a positive MR at higher temperatures. We show that the negative MR contribution is only observed for the ferromagnetic ...


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