Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet
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. Furthermore, 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.
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1307437
- Grant/Contract Number:
- SC0006418
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Lee, Changmin, Katmis, Ferhat, Jarillo-Herrero, Pablo, Moodera, Jagadeesh S., and Gedik, Nuh. Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet. United States: N. p., 2016.
Web. doi:10.1038/ncomms12014.
Lee, Changmin, Katmis, Ferhat, Jarillo-Herrero, Pablo, Moodera, Jagadeesh S., & Gedik, Nuh. Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet. United States. https://doi.org/10.1038/ncomms12014
Lee, Changmin, Katmis, Ferhat, Jarillo-Herrero, Pablo, Moodera, Jagadeesh S., and Gedik, Nuh. Mon .
"Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet". United States. https://doi.org/10.1038/ncomms12014. https://www.osti.gov/servlets/purl/1307437.
@article{osti_1307437,
title = {Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet},
author = {Lee, Changmin and Katmis, Ferhat and Jarillo-Herrero, Pablo and Moodera, Jagadeesh S. and Gedik, Nuh},
abstractNote = {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. Furthermore, 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.},
doi = {10.1038/ncomms12014},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {6}
}
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