Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-06-22
Phys. Rev. B 82, 161401 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 2 figures
Scientific paper
10.1103/PhysRevB.82.161401
A three-dimensional topological insulator manifests gapless surface modes, described by two-dimensional Dirac equation. We study magnetic textures, such as domain walls and vortices, in a ferromagnetic thin film deposited on a three-dimensional topological insulator. It is shown that these textures can be electrically charged, ascribed to the proximity effect with the Dirac surface states. We derive a general relation between the electric and the magnetic charges. As a physical consequence, we discuss domain wall motion driven by an applied electric field, which promises magnetic devices with high thermal efficiency.
Nagaosa Naoto
Nomura Kentaro
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