Spin-dependent transport and current-induced spin transfer torque in a disordered zigzag silicene nanoribbon

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• 作者：Benliang Zhou^a ; Benhu Zhou^b ; Guang Liu^a ; Dan Guo^a ; Guanghui Zhou^a ; ^{ghzhou@hunnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ZSiNR ; Anderson disorder ; STT ; NEGF
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：500
• 期：Complete
• 页码：106-110
• 全文大小：563 K

文摘

We study theoretically the spin-dependent transport and the current-induced spin transfer torque (STT) for a zigzag silicene nanoribbon (ZSiNR) with Anderson-type disorders between two ferromagnetic electrodes. By using the nonequilibrium Green's function method, it is predicted that the transport property and STT through the junction depend sensitively on the disorder, especially around the Dirac point. As a result, the conductance decreases and increases for two electrode in parallel and antiparallel configurations, respectively. Due to the disorder, the magnetoresistance (MR) decreases accordingly even within the energy regime for the perfect plateau without disorders. In addition, the conductance versus the relative angle of the magnetization shows a cosine-like behavior. The STT per unit of the bias voltage versus the angle of the magnetization exhibits a sine-like behavior, and versus the Fermi energy is antisymmetrical to the Dirac point and exhibits sharp peaks. Furthermore, the peaks of the STT are suppressed much as the disorder strength increases, especially around the Dirac point. The results obtained here may provide a valuable suggestion to experimentally design spin valve devices based on ZSiNR.