Kang Dawei, Wang Bowen, Xia Caijuan, Li Haisheng
School of Physics and Engineering, Henan University of Science and Technology, Luoyang, 471023, China.
School of Science, Xi'an Polytechnic University, Xi'an, 710048, China.
Nanoscale Res Lett. 2017 Dec;12(1):357. doi: 10.1186/s11671-017-2132-7. Epub 2017 May 18.
Zigzag graphene nanoribbons (ZGNRs) are expected to serve as the promising component in the all-carbon spintronic device. It remains challenging to fabricate a device based on ZGNRs with high spin-filter efficiency and low experimental complexity. Using density functional theory combined with nonequilibrium Green's function technique, we studied the spin-dependent transport properties of the tailored zigzag graphene nanoribbon. A perfect spin-filtering effect is found in the tailored structure of ZGNR. The nearly 100% spin-polarized current and high magneto-resistance ratio can be obtained by applying a homogeneous magnetic field across the device. The distribution of spin up and spin down states at the bridge carbon atom plays a dominant role in the perfect spin filtering. The tailoring of ZGNR provides a new effective approach to graphene-based spintronics.
锯齿形石墨烯纳米带（ZGNRs）有望成为全碳自旋电子器件中有前景的组件。制造基于ZGNRs且具有高自旋过滤效率和低实验复杂度的器件仍然具有挑战性。利用密度泛函理论结合非平衡格林函数技术，我们研究了定制锯齿形石墨烯纳米带的自旋相关输运特性。在ZGNR的定制结构中发现了完美的自旋过滤效应。通过在器件上施加均匀磁场，可以获得近100%的自旋极化电流和高磁阻比。桥碳原子处自旋向上和自旋向下状态的分布在完美自旋过滤中起主导作用。ZGNR的定制为基于石墨烯的自旋电子学提供了一种新的有效方法。
