Zusammenfassung
We investigate spin-dependent transport through an epitaxial GaAs(001) barrier sandwiched between polycrystalline iron films. Electron transport through the barrier is dominated by quantum mechanical tunneling, demonstrated by a nonlinear I�V characteristic, an exponential dependence of the tunneling current on the barrier thickness and the temperature dependence of the current. Though ...
Zusammenfassung
We investigate spin-dependent transport through an epitaxial GaAs(001) barrier sandwiched between polycrystalline iron films. Electron transport through the barrier is dominated by quantum mechanical tunneling, demonstrated by a nonlinear I�V characteristic, an exponential dependence of the tunneling current on the barrier thickness and the temperature dependence of the current. Though small a clear tunneling magnetoresistance effect proves spin- dependent transport through the Fe�GaAs interface. The small size of the effect and the high-field magnetoresistance suggest that spin�flip scattering plays a decisive role in transport.
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