Domain wall of a ferromagnet on a three-dimensional topological insulator

被引：47

作者：

Wakatsuki, Ryohei ^{[1
]}

Ezawa, Motohiko ^{[1
]}

Nagaosa, Naoto ^{[1
,2
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[2] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

关键词：

DIRAC-FERMION; REALIZATION; SURFACE; STATE;

D O I：

10.1038/srep13638

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Topological insulators (TIs) show rich phenomena and functions which can never be realized in ordinary insulators. Most of them come from the peculiar surface or edge states. Especially, the quantized anomalous Hall effect (QAHE) without an external magnetic field is realized in the two-dimensional ferromagnet on a three-dimensional TI which supports the dissipationless edge current. Here we demonstrate theoretically that the domain wall of this ferromagnet, which carries edge current, is charged and can be controlled by the external electric field. The chirality and relative stability of the Neel wall and Bloch wall depend on the position of the Fermi energy as well as the form of the coupling between the magnetic moments and orbital of the host TI. These findings will pave a path to utilize the magnets on TI for the spintronics applications.

引用

页数：10

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