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

Zenger, Marcus ; Moser, Jürgen ; Wegscheider, Werner ; Weiss, Dieter ; Dietl, T.
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Date of publication of this fulltext: 11 Jan 2010 13:21


Abstract

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 iron ...

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