Kreuzer, Sebastian and Moser, Jürgen and Wegscheider, Werner and Weiss, Dieter and Bichler, Max and Schuh, Dieter
Spin polarized tunneling through single-crystal GaAs(001) barriers.
Applied Physics Letters 80 (1-4), pp. 4582-4584.
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.