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 S.; Gedik, Nuh

doi:10.1038/ncomms12014

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

Journal Article · 27 June 2016 · Nature Communications

DOI: https://doi.org/10.1038/ncomms12014 · OSTI ID:1307437

Lee, Changmin ^[1]; Katmis, Ferhat ^[1]; Jarillo-Herrero, Pablo ^[1]; Moodera, Jagadeesh S. ^[1];

^[1]

Massachusetts Institute of Technology, Cambridge, MA (United States)

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.

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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

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