Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet
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 variou...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2017
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| Online Access: | http://hdl.handle.net/1721.1/108054 https://orcid.org/0000-0002-9386-3483 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-6394-4987 |
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| author | Lee, Changmin Katmis, Ferhat Jarillo-Herrero, Pablo Moodera, Jagadeesh Gedik, Nuh |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Lee, Changmin Katmis, Ferhat Jarillo-Herrero, Pablo Moodera, Jagadeesh Gedik, Nuh |
| author_sort | Lee, Changmin |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:33:18Z |
| format | Article |
| id | mit-1721.1/108054 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:33:18Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1080542022-09-30T09:32:39Z Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet Lee, Changmin Katmis, Ferhat Jarillo-Herrero, Pablo Moodera, Jagadeesh Gedik, Nuh Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) Lee, Changmin Katmis, Ferhat Jarillo-Herrero, Pablo Moodera, Jagadeesh Gedik, Nuh 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. Samsung Foundation of Culture (Scholarship) National Science Foundation (U.S.) (STC Center for Integrated Quantum Materials. Grant DMR-1231319) Gordon and Betty Moore Foundation (EPiQS Initiative Grant GBMF4540) National Science Foundation (U.S.). Division of Materials Research (Grant DMR-1207469) National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Grant DMR-0819762) United States. Dept. of Energy. Division of Materials Sciences and Engineering (Award DE-SC0006418) United States. Office of Naval Research (Grant N00014-13-1-0301) 2017-04-11T18:59:45Z 2017-04-11T18:59:45Z 2016-06 2016-02 Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/108054 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, https://orcid.org/0000-0002-9386-3483 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-6394-4987 en_US http://dx.doi.org/10.1038/ncomms12014 Nature Communications Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature |
| spellingShingle | Lee, Changmin Katmis, Ferhat Jarillo-Herrero, Pablo Moodera, Jagadeesh Gedik, Nuh Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title | Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title_full | Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title_fullStr | Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title_full_unstemmed | Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title_short | Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet |
| title_sort | direct measurement of proximity induced magnetism at the interface between a topological insulator and a ferromagnet |
| url | http://hdl.handle.net/1721.1/108054 https://orcid.org/0000-0002-9386-3483 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-6394-4987 |
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