Colossal anisotropy in diluted magnetic topological insulators

Abstract

We consider dilute magnetic doping in the surface of a three dimensional topological insulator where a two dimensional Dirac electron gas resides. We find that exchange coupling between magnetic atoms and the Dirac electrons has a strong and peculiar effect on both. First, the exchange-induced single ion magnetic anisotropy is very large and favors off-plane orientation. In the case of ferromagnetically ordered phase we find a colossal magnetic anisotropy energy, of the order of the critical temperature. Second, a persistent electronic current circulates around the magnetic atom and, in the case of a ferromagnetic phase, around the edges of the surface.

4 pages, 3 figures

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Cited by in corpus (13)

• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
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• Scaling of the Quantum Anomalous Hall Effect as an Indicator of Axion Electrodynamics
• Magnetic edge anisotropy in graphene-like honeycomb crystals
• Systematics of electronic and magnetic properties in the transition metal doped Sb${}_2$Te${}_3$ quantum anomalous Hall platform
• Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators
• Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi${}_2$Te${}_3$
• Large Itinerant Electron Exchange Coupling in the Magnetic Topological Insulator MnBi2Te4
• Gate-tunable ferromagnetism in a van der Waals magnetic semimetal
• Temperature Induced Spin Density Wave in Magnetic Doped Topological Insulators
• Theory of Cross-correlated Electron-Magnon Transport Phenomena: Case of Magnetic Topological Insulator
• Tunable magnetic anisotropy from higher-harmonics exchange scattering on the surface of a topological insulator
• Topological Magnetoelectric Switching on the Atomic Scale