Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures
The possible realization of dissipationless chiral edge current in a topological insulator/magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. Here we report...
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| Format: | Article |
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American Physical Society (APS)
2018
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| Online Access: | http://hdl.handle.net/1721.1/117658 https://orcid.org/0000-0002-7055-6368 https://orcid.org/0000-0002-1090-4068 https://orcid.org/0000-0002-1157-8540 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7413-5715 |
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| author | Zhao, Weiwei Garlow, Joseph A. Wu, Lijun Zhu, Yimei Chan, Moses H. W. Li, Mingda Song, Qichen Liu, Te Huan Moodera, Jagadeesh Chen, Gang Chang, Cui-zu |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Zhao, Weiwei Garlow, Joseph A. Wu, Lijun Zhu, Yimei Chan, Moses H. W. Li, Mingda Song, Qichen Liu, Te Huan Moodera, Jagadeesh Chen, Gang Chang, Cui-zu |
| author_sort | Zhao, Weiwei |
| collection | MIT |
| description | The possible realization of dissipationless chiral edge current in a topological insulator/magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. Here we report a polarized neutron reflectometry observation of Dirac-electron-mediated magnetic proximity effect in a bulk-insulating topological insulator (Bi0.2Sb0.8)2Te3/magnetic insulator EuS heterostructure. We are able to maximize the proximity-induced magnetism by applying an electrical back gate to tune the Fermi level of topological insulator to be close to the Dirac point. A phenomenological model based on diamagnetic screening is developed to explain the suppressed proximity-induced magnetism at high carrier density. Our work paves the way to utilize the magnetic proximity effect at the topological insulator/magnetic insulator heterointerface for low-power spintronic applications. |
| first_indexed | 2024-09-23T10:53:00Z |
| format | Article |
| id | mit-1721.1/117658 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:53:00Z |
| publishDate | 2018 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1176582022-09-27T15:44:33Z Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures Zhao, Weiwei Garlow, Joseph A. Wu, Lijun Zhu, Yimei Chan, Moses H. W. Li, Mingda Song, Qichen Liu, Te Huan Moodera, Jagadeesh Chen, Gang Chang, Cui-zu Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Massachusetts Institute of Technology. Plasma Science and Fusion Center Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) Li, Mingda Song, Qichen Liu, Te Huan Moodera, Jagadeesh Chen, Gang Chang, Cui-zu The possible realization of dissipationless chiral edge current in a topological insulator/magnetic insulator heterostructure is based on the condition that the magnetic proximity exchange coupling at the interface is dominated by the Dirac surface states of the topological insulator. Here we report a polarized neutron reflectometry observation of Dirac-electron-mediated magnetic proximity effect in a bulk-insulating topological insulator (Bi0.2Sb0.8)2Te3/magnetic insulator EuS heterostructure. We are able to maximize the proximity-induced magnetism by applying an electrical back gate to tune the Fermi level of topological insulator to be close to the Dirac point. A phenomenological model based on diamagnetic screening is developed to explain the suppressed proximity-induced magnetism at high carrier density. Our work paves the way to utilize the magnetic proximity effect at the topological insulator/magnetic insulator heterointerface for low-power spintronic applications. United States. Department of Energy. Office of Basic Energy Sciences (Award DE-SC0001299) United States. Department of Energy. Office of Basic Energy Sciences (Award DE-FG02-09ER46577) 2018-09-06T19:27:06Z 2018-09-06T19:27:06Z 2017-11 2017-06 2018-08-28T13:52:24Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/117658 Li, Mingda et al. “Dirac-Electron-Mediated Magnetic Proximity Effect in Topological Insulator/magnetic Insulator Heterostructures.” Physical Review B 96, 20 (November 2017): 201301(R) © 2017 American Physical Society https://orcid.org/0000-0002-7055-6368 https://orcid.org/0000-0002-1090-4068 https://orcid.org/0000-0002-1157-8540 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7413-5715 http://dx.doi.org/10.1103/PHYSREVB.96.201301 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Zhao, Weiwei Garlow, Joseph A. Wu, Lijun Zhu, Yimei Chan, Moses H. W. Li, Mingda Song, Qichen Liu, Te Huan Moodera, Jagadeesh Chen, Gang Chang, Cui-zu Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title | Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title_full | Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title_fullStr | Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title_full_unstemmed | Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title_short | Dirac-electron-mediated magnetic proximity effect in topological insulator/magnetic insulator heterostructures |
| title_sort | dirac electron mediated magnetic proximity effect in topological insulator magnetic insulator heterostructures |
| url | http://hdl.handle.net/1721.1/117658 https://orcid.org/0000-0002-7055-6368 https://orcid.org/0000-0002-1090-4068 https://orcid.org/0000-0002-1157-8540 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7413-5715 |
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