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Spin-dependent transport for a two-dimensional electron gas with magnetic barriers
Authors:Wang Hai-Yan  Duan Zi-Gang  Liao Wen-Hu and Zhou Guang-Hui
Institution:Department of Physics, Hunan Normal University, Changsha 410081, China; Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China
Abstract:The spin-dependent conductance and magnetoresistance ratio (MRR) for a semiconductor heterostructures consisting of two magnetic barriers with different height and space have been investigated by the transfer-matrix method. It is shown that the splitting of the conductance for parallel and antiparallel magnetization configurations results in tremendous spin-dependent MRR, and the maximal MRRs reach 5300\% and 3800\% for the magnetic barrier spaces W=81.3 and 243.9~nm, respectively. The obtained spin-filtering transport property of nanostructures with magnetic barriers may be useful to magnetic-barrier-based spintronics.
Keywords:semiconductor 2DEG  magnetic barriers  spin-dependent transport
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