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Enhancing magnetic ordering in Cr-doped Bi2Se3 using high-Tc ferrimagnetic insulator

DOI: 10.1021/nl504480g DOI Help

Authors: Wenqing Liu (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Liang He (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Yongbing Xu (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Koichi Murata (University of California) , Mehmet C. Onbasli (Massachusetts Institute of Technology) , Murong Lang (University of California) , Nick Maltby (University of York) , Shunpu Li (University of York) , Xuefeng Wang (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Caroline A. Ross (Massachusetts Institute of Technology) , Peter Bencok (Diamond Light Source) , Gerrit Van Der Laan (Diamond Light Source) , Rong Zhang (York-Nanjing Joint Center for Spintronics and Nano Engineering) , Kang. L. Wang (University of California)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Letters , VOL 15 (1) , PAGES 764 - 769

State: Published (Approved)
Published: January 2015
Diamond Proposal Number(s): 9953

Abstract: We report a study of enhancing the magnetic ordering in a model magnetically doped topological insulator (TI), Bi2-xCrxSe3, via the proximity effect using a high-TC ferrimagnetic insulator Y3Fe5O12. The FMI provides the TI with a source of exchange interaction yet without removing the nontrivial surface state. By performing the elemental specific X-ray magnetic circular dichroism (XMCD) measurements, we have unequivocally observed an enhanced TC of 50 K in this magnetically doped TI/FMI heterostructure. We have also found a larger (6.6 nm at 30 K) but faster decreasing (by 80% from 30 to 50 K) penetration depth compared to that of diluted ferromagnetic semiconductors (DMSs), which could indicate a novel mechanism for the interaction between FMIs and the nontrivial TIs surface. KEYWORDS: Magnetic topological insulator, XMCD, proximity effect, ferrimagnetic insulator YIG, spintronics

Journal Keywords: Magnetic topological insulator; XMCD; proximity effect; ferrimagnetic insulator YIG; spintronics

Diamond Keywords: Ferrimagnetism; Ferromagnetism; Spintronics

Subject Areas: Engineering, Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

Other Facilities: no

Added On: 23/01/2015 10:47

Discipline Tags:

Quantum Materials Physics Electronics Magnetism Materials Science

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)