Switching on ferromagnetic coupling by Mn/Sb antisite disorder in Mn(Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>4</sub>Te<sub>7</sub>
ORAL
Abstract
The fine control of magnetism in topological magnetic materials is crucial since the interplay between magnetism and band topology can lead to exotic emergent phenomena, such as quantum anomalous Hall effect, etc. We present a continuous control of the interlayer magnetic coupling in the newly-discovered intrinsic topological insulator MnBi4Te7 by Sb-doping. Through the transport and thermodynamic measurements, it is revealed how the system evolves from antiferromagnetic to ferromagnetic and then ferrimagnetic. We attribute this evolution to the formation of the Mn/Sb antisite disorder which not only leads to the magnetic dilution effect, but also results in extra Mn2/Mn3 magnetic sublattices which act as a switch for dominant Mn1 sublattice in MnBi4Te7 to go from antiferromagnetic to ferromagnetic. Therefore, our work provides a system with continuous tuning of the delicate magnetic energy scales in an intrinsic topological insulator and demonstrates defect control as an efficient strategy toward the magnetic control in the system.
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Presenters
Chaowei Hu
University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy Department, University of California, Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles
Authors
Chaowei Hu
University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy Department, University of California, Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles
Scott Mackey
University of California, Los Angeles
Ni Ni
University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy Department, University of California, Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles
