Different noncollinear magnetizations on two edges of zigzag graphene nanoribbons
Different noncollinear magnetizations on two edges of zigzag graphene nanoribbons
复制标题
锯齿状石墨烯纳米带两侧不同的非共线磁化强度
DOI：
10.1088/1674-1056/abc0e4
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发表时间：
2020-12
影响因子：
1.7
通讯作者：
张影
中科院分区：
文献类型：
--
作者：
肖杨;叶巧利;梁锦涛;颜晓红;张影
基于密度泛函理论和非平衡绿色函数方法，研究了锯齿形石墨烯纳米晶（ZGNR）180畴壁中的非共线磁性和自旋输运.我们的研究结果表明，螺旋畴壁的顶部（底部）边缘和突变畴壁的底部（顶部）边缘可以生存在ZGNR。这表明这种特征磁化强度分布可以通过某种方式获得，例如在一边引入杂质。与宽的ZGNR相比，窄的ZGNR在两个边缘之间呈现出明显的耦合，这极大地改变了磁化和透射。对于上述不同的磁分布，自旋输运在突变畴壁中由于强自旋翻转散射而被阻挡，而在螺旋畴壁中由于自旋混合效应而保持不受影响。我们推导出了ZGNRs的各种磁剖面的传输公式。基于该公式的一个新结果是，通过调节边缘磁化强度，费米能级处的透射率可以是零、一和二。我们的研究结果提供了深入了解的ZGNR为基础的设备的非共线自旋输运。（文件）
Based on density functional theory and non-equilibrium Green's function method, we studied noncollinear magnetism and spin transport in a 180 domain wall made of zigzag graphene nanoribbon (ZGNR) with different noncollinear magnetic profiles on the top and bottom edges. Our results show that a helical domain wall on the top (bottom) edge and an abrupt domain wall on the bottom (top) edge can survive in the ZGNR. This indicates that such characteristic magnetization distribution can be obtained by some means, eg, the introduction of impurity on one edge. Compared to a wide ZGNR, a narrow ZGNR presents obvious coupling between the two edges which changes the magnetization and transmission greatly. As for the above-mentioned distinct magnetic profile, the spin transport is blocked in the abrupt domain wall due to strong spin flip scattering while remains unaffected in the helical domain wall due to the spin mixing effect. We deduce a formula of the transmission for various magnetic profiles of the ZGNRs. A new result based on this formula is that the transmission at the Fermi level can be zero, one, and two by tuning the edge magnetization. Our results provide insights into the noncollinear spin transport of the ZGNR-based devices.(paper)
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影响因子：
3.2
作者：
Yihui Zhang;X. H. Yan;Yufeng Guo;Yang Xiao
通讯作者：
Yihui Zhang;X. H. Yan;Yufeng Guo;Yang Xiao
影响因子：
3.7
作者：
A. Pachoud;Aires Ferreira;B. Ozyilmaz;A. Neto
通讯作者：
A. Pachoud;Aires Ferreira;B. Ozyilmaz;A. Neto
DOI：
10.1103/physrevb.40.399
发表时间：
1989-07
期刊：
Physical review. B, Condensed matter
影响因子：
--
作者：
Press;Liu;Khanna;Jena
通讯作者：
Press;Liu;Khanna;Jena
影响因子：
3.7
作者：
Jeongsu Lee;J. Fabian
通讯作者：
Jeongsu Lee;J. Fabian
影响因子：
3.7
作者：
Brandbyge, M;Mozos, JL;Stokbro, K
通讯作者：
Stokbro, K