Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet
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Direct measurement.pdf
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Author(s)
Lee, Changmin
Katmis, Ferhat
Jarillo-Herrero, Pablo
Moodera, Jagadeesh
Gedik, Nuh
Date Issued
June 2016
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Lee, Changmin et al. “Direct Measurement of Proximity-Induced Magnetism at the Interface between a Topological Insulator and a Ferromagnet.” Nature Communications 7 (2016): 12014. © 2017 Macmillan Publishers Limited,
Version
Final published version
Abstract
When a topological insulator (TI) is in contact with a ferromagnet, both time-reversal and inversion symmetries are broken at the interface. An energy gap is formed at the TI surface, and its electrons gain a net magnetic moment through short-range exchange interactions. Magnetic TIs can host various exotic quantum phenomena, such as massive Dirac fermions, Majorana fermions, the quantum anomalous Hall effect and chiral edge currents along the domain boundaries. However, selective measurement of induced magnetism at the buried interface has remained a challenge. Using magnetic second-harmonic generation, we directly probe both the in-plane and out-of-plane magnetizations induced at the interface between the ferromagnetic insulator (FMI) EuS and the three-dimensional TI Bi2Se3. Our findings not only allow characterizing magnetism at the TI–FMI interface but also lay the groundwork for imaging magnetic domains and domain boundaries at the magnetic TI surfaces.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/ncomms12014
