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Experimental observation of dual magnetic states in topological insulators

DOI: 10.1126/sciadv.aav2088 DOI Help

Authors: Wenqing Liu (York-Nanjing Joint Center (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University; Royal Holloway University of London) , Yongbing Xu (York-Nanjing Joint Center (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University; The University of York) , Liang He (York-Nanjing Joint Center (YNJC) for Spintronics and Nanoengineering, School of Electronics Science and Engineering, Nanjing University; University of California) , Gerrit Van Der Laan (Diamond Light Source) , Rong Zhang (Royal Holloway University of London) , Kang Wang (University of California)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 5

State: Published (Approved)
Published: February 2019
Diamond Proposal Number(s): 20748

Open Access Open Access

Abstract: The recently discovered topological phase offers new possibilities for spintronics and condensed matter. Even insulating material exhibits conductivity at the edges of certain systems, giving rise to an anomalous quantum Hall effect and other coherent spin transport phenomena, in which heat dissipation is minimized, with potential uses for next-generation energy-efficient electronics. While the metallic surface states of topological insulators (TIs) have been extensively studied, direct comparison of the surface and bulk magnetic properties of TIs has been little explored. We report unambiguous evidence for distinctly enhanced surface magnetism in a prototype magnetic TI, Cr-doped Bi2Se3. Using synchrotron-based x-ray techniques, we demonstrate a “three-step transition” model, with a temperature window of ~15 K, where the TI surface is magnetically ordered while the bulk is not. Understanding the dual magnetization process has strong implications for defining a physical modelof magnetic TIs and lays the foundation for applications to information technology.

Journal Keywords: Magnetism; XMCD; spintronics; multiplet calculations; topological insulators

Subject Areas: Physics, Materials, Information and Communication Technology

Diamond Offline Facilities: Magnetic Spectroscopy Lab
Instruments: I10-Beamline for Advanced Dichroism

Documents:
eaav2088.full.pdf