Journal
PHYSICAL REVIEW B
Volume 82, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.161401
Keywords
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Funding
- MEXT [20740167, 19048008, 19048015, 21244053]
- Japan Science and Technology Agency
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [21244053, 20740167] Funding Source: KAKEN
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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.
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