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Title: Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12014· OSTI ID:1307437

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006418
OSTI ID:
1307437
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (20)

Above 400-K robust perpendicular ferromagnetic phase in a topological insulator journal June 2017
Giant Edelstein effect in topological-insulator–graphene heterostructures journal December 2017
Fluctuation-induced Néel and Bloch skyrmions at topological insulator surfaces journal August 2018
Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering journal January 2018
Fine structure of metal–insulator transition in EuO resolved by doping engineering journal March 2018
The 2017 Magnetism Roadmap journal August 2017
Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures journal January 2018
Topological phase transition induced by magnetic proximity effect in two dimensions journal July 2019
Universal current correlations induced by the Majorana and fermionic Andreev bound states journal July 2019
Intrinsic Van Der Waals Magnetic Materials from Bulk to the 2D Limit: New Frontiers of Spintronics journal May 2019
Layer-resolved magnetic proximity effect in van der Waals heterostructures journal January 2020
Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics journal May 2017
Pursuing the high-temperature quantum anomalous Hall effect in MnBi 2 Te 4 / Sb 2 Te 3 heterostructures journal January 2020
Interface depended electronic and magnetic properties of vertical CrI 3 /WSe 2 heterostructures journal January 2019
Interface effects on the magnetic-proximity-induced quantized Hall response in heterostructures based on three-dimensional topological insulators journal March 2019
Magnetic profile of proximity-coupled ( Dy , Bi ) 2 Te 3 / ( Cr , Sb ) 2 Te 3 topological insulator heterostructures journal August 2019
Giant tunneling magnetoresistance in spin-filter van der Waals heterostructures journal May 2018
Van der Waals Engineering of Ferromagnetic Semiconductor Heterostructures for Spin and Valleytronics text January 2017
Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator text January 2017
Topological phase transition induced by magnetic proximity effect in two dimensions text January 2019

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