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Evidence for ferromagnetic coupling at the doped topological insulator/ferrimagnetic insulator interface

DOI: 10.1063/1.4943157 DOI Help

Authors: Wenqing Liu (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Liang He (Nanjing University) , Yan Zhou (Nanjing University) , Koichi Murata (University of California) , Mehmet C. Onbasli (MIT) , Caroline A. Ross (MIT) , Ying Jiang (Zhejiang University) , Yong Wang (Zhejiang University) , Yongbing Xu (University of York) , Rong Zhang (Nanjing University) , Kang. L. Wang (University of California)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Aip Advances , VOL 6

State: Published (Approved)
Published: May 2016
Diamond Proposal Number(s): 12660

Abstract: One of the major obstacles of the magnetic topological insulators (TIs) impeding their practical use is the low Curie temperature (Tc). Very recently, we have demonstrated the enhancement of the magnetic ordering in Cr-doped Bi2Se3 by means of proximity to the high-Tcferrimagneticinsulator (FMI) Y3Fe5O12 and found a large and rapidly decreasing penetration depth of the proximity effect, suggestive of a different carrier propagation process near the TI surface. Here we further present a study of the interfacial magnetic interaction of this TI/FMI heterostrucutre. The synchrotron-based X-ray magnetic circular dichroism (XMCD) technique was used to probe the nature of the exchange coupling of the Bi2−xCrxSe3/Y3Fe5O12 interface. We found that the Bi2−xCrxSe3grown on Y3Fe5O12(111) predominately contains Cr3+ cations, and the spin direction of the Cr3+ is aligned parallel to that of tetrahedral Fe3+ of the YIG, revealing a ferromagnetic exchange coupling between the Bi2−xCrxSe3 and the Y3Fe5O12.

Journal Keywords: Doping; Ferromagnetism; Superconducting proximity effects; Insulators; Magnetic films

Subject Areas: Physics


Instruments: I10-Beamline for Advanced Dichroism