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Title: A high-temperature ferromagnetic topological insulating phase by proximity coupling

Abstract

Topological insulators are insulating materials that display conducting surface states protected by time-reversal symmetry1,2, wherein electron spins are locked to their momentum. This unique property opens up new opportunities for creating next-generation electronic, spintronic and quantum computation devices3,4,5. Introducing ferromagnetic order into a topological insulator system without compromising its distinctive quantum coherent features could lead to the realization of several predicted physical phenomena6,7. In particular, achieving robust long-range magnetic order at the surface of the topological insulator at specific locations without introducing spin-scattering centres could open up new possibilities for devices. Here we use spin-polarized neutron reflectivity experiments to demonstrate topologically enhanced interface magnetism by coupling a ferromagnetic insulator (EuS) to a topological insulator (Bi2Se3) in a bilayer system. This interfacial ferromagnetism persists up to room temperature, even though the ferromagnetic insulator is known to order ferromagnetically only at low temperatures (<17 K). The magnetism induced at the interface resulting from the large spin–orbit interaction and the spin–momentum locking of the topological insulator surface greatly enhances the magnetic ordering (Curie) temperature of this bilayer system. The ferromagnetism extends ~2 nm into the Bi2Se3 from the interface. Owing to the short-range nature of the ferromagnetic exchange interaction, the time-reversal symmetry ismore » broken only near the surface of a topological insulator, while leaving its bulk states unaffected. The topological magneto-electric response originating in such an engineered topological insulator2,8 could allow efficient manipulation of the magnetization dynamics by an electric field, providing an energy-efficient topological control mechanism for future spin-based technologies« less

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5];  [1];  [6];  [7];  [8];  [5];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ruhr Univ., Bochum (Germany); Inst. fuer Festkoerper- und Werkstoffforschung, Dresden (Germany)
  4. Northeastern Univ., Boston, MA (United States); Paris Sciences et Lettres Research Univ. (France)
  5. Northeastern Univ., Boston, MA (United States)
  6. Saha Inst. of Nuclear Physics, Kolkata (India)
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  8. Ruhr Univ., Bochum (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1633180
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 533; Journal Issue: 7604; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Katmis, Ferhat, Lauter, Valeria, Nogueira, Flavio S., Assaf, Badih A., Jamer, Michelle E., Wei, Peng, Satpati, Biswarup, Freeland, John W., Eremin, Ilya, Heiman, Don, Jarillo-Herrero, Pablo, and Moodera, Jagadeesh S. A high-temperature ferromagnetic topological insulating phase by proximity coupling. United States: N. p., 2016. Web. doi:10.1038/nature17635.
Katmis, Ferhat, Lauter, Valeria, Nogueira, Flavio S., Assaf, Badih A., Jamer, Michelle E., Wei, Peng, Satpati, Biswarup, Freeland, John W., Eremin, Ilya, Heiman, Don, Jarillo-Herrero, Pablo, & Moodera, Jagadeesh S. A high-temperature ferromagnetic topological insulating phase by proximity coupling. United States. doi:10.1038/nature17635.
Katmis, Ferhat, Lauter, Valeria, Nogueira, Flavio S., Assaf, Badih A., Jamer, Michelle E., Wei, Peng, Satpati, Biswarup, Freeland, John W., Eremin, Ilya, Heiman, Don, Jarillo-Herrero, Pablo, and Moodera, Jagadeesh S. Mon . "A high-temperature ferromagnetic topological insulating phase by proximity coupling". United States. doi:10.1038/nature17635. https://www.osti.gov/servlets/purl/1633180.
@article{osti_1633180,
title = {A high-temperature ferromagnetic topological insulating phase by proximity coupling},
author = {Katmis, Ferhat and Lauter, Valeria and Nogueira, Flavio S. and Assaf, Badih A. and Jamer, Michelle E. and Wei, Peng and Satpati, Biswarup and Freeland, John W. and Eremin, Ilya and Heiman, Don and Jarillo-Herrero, Pablo and Moodera, Jagadeesh S.},
abstractNote = {Topological insulators are insulating materials that display conducting surface states protected by time-reversal symmetry1,2, wherein electron spins are locked to their momentum. This unique property opens up new opportunities for creating next-generation electronic, spintronic and quantum computation devices3,4,5. Introducing ferromagnetic order into a topological insulator system without compromising its distinctive quantum coherent features could lead to the realization of several predicted physical phenomena6,7. In particular, achieving robust long-range magnetic order at the surface of the topological insulator at specific locations without introducing spin-scattering centres could open up new possibilities for devices. Here we use spin-polarized neutron reflectivity experiments to demonstrate topologically enhanced interface magnetism by coupling a ferromagnetic insulator (EuS) to a topological insulator (Bi2Se3) in a bilayer system. This interfacial ferromagnetism persists up to room temperature, even though the ferromagnetic insulator is known to order ferromagnetically only at low temperatures (<17 K). The magnetism induced at the interface resulting from the large spin–orbit interaction and the spin–momentum locking of the topological insulator surface greatly enhances the magnetic ordering (Curie) temperature of this bilayer system. The ferromagnetism extends ~2 nm into the Bi2Se3 from the interface. Owing to the short-range nature of the ferromagnetic exchange interaction, the time-reversal symmetry is broken only near the surface of a topological insulator, while leaving its bulk states unaffected. The topological magneto-electric response originating in such an engineered topological insulator2,8 could allow efficient manipulation of the magnetization dynamics by an electric field, providing an energy-efficient topological control mechanism for future spin-based technologies},
doi = {10.1038/nature17635},
journal = {Nature (London)},
number = 7604,
volume = 533,
place = {United States},
year = {2016},
month = {5}
}

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