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

Wakatsuki R, Ezawa M, Nagaosa N - Sci Rep (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

Electron density distribution of the optimized domain wall structure for various chemical potential for (a) J3 = 0 and (b) J3 = J0.Electrons (holes) are localized at the zero-energy states due to the magnetic domain wall for μ > 0 (μ < 0). The numbers ±1, ±3 indicate the electron number measured from the half-filling. The horizontal axis is the x coordinate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4555097&req=5

f4: Electron density distribution of the optimized domain wall structure for various chemical potential for (a) J3 = 0 and (b) J3 = J0.Electrons (holes) are localized at the zero-energy states due to the magnetic domain wall for μ > 0 (μ < 0). The numbers ±1, ±3 indicate the electron number measured from the half-filling. The horizontal axis is the x coordinate.

Mentions: We demonstrate in Fig. 4 the electron density distribution of the upper half layers for the minimum-energy domain wall configuration numerically calculated via the expression


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

Wakatsuki R, Ezawa M, Nagaosa N - Sci Rep (2015)

Electron density distribution of the optimized domain wall structure for various chemical potential for (a) J3 = 0 and (b) J3 = J0.Electrons (holes) are localized at the zero-energy states due to the magnetic domain wall for μ > 0 (μ < 0). The numbers ±1, ±3 indicate the electron number measured from the half-filling. The horizontal axis is the x coordinate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555097&req=5

f4: Electron density distribution of the optimized domain wall structure for various chemical potential for (a) J3 = 0 and (b) J3 = J0.Electrons (holes) are localized at the zero-energy states due to the magnetic domain wall for μ > 0 (μ < 0). The numbers ±1, ±3 indicate the electron number measured from the half-filling. The horizontal axis is the x coordinate.
Mentions: We demonstrate in Fig. 4 the electron density distribution of the upper half layers for the minimum-energy domain wall configuration numerically calculated via the expression

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus