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Ferromagnetic Interlayer Exchange Coupling in Magnetic Topological Insulator Sandwich Heterostructures.

Enayet Hossain1,2,3, Grace L Causer1,2, Qile Li1,2

  • 1School of Physics and Astronomy, Monash University, Clayton, Victoria, Australia.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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A single septuple layer (SL) of MnBi2Te4 integrated with Bi2Te3 showcases tunable magnetic coupling. Even a single quintuple layer (QL) of Bi2Te3 switches antiferromagnetism to ferromagnetism in MnBi2Te4 heterostructures.

Keywords:
anomalous Hall effectantiferromagnetisminterlayer exchange couplingmagnetic topological insulatorproximity magnetization

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) ferromagnetic insulators like MnBi2Te4 are key for van der Waals heterostructures.
  • Integrating magnetism with topology requires precise control over interlayer interactions.

Purpose of the Study:

  • Investigate the effect of Bi2Te3 spacer thickness on magnetic coupling in MnBi2Te4 heterostructures.
  • Explore the potential for engineering magnetic ground states and topological quantum phases.

Main Methods:

  • Fabrication of MnBi2Te4/nQL Bi2Te3/MnBi2Te4 sandwich heterostructures (n=0-4).
  • Electrical transport measurements, including magnetotransport and Hall hysteresis loops.

Main Results:

  • A single quintuple layer (QL) of Bi2Te3 is sufficient to induce ferromagnetic coupling in the MnBi2Te4 layers.
  • Increasing Bi2Te3 spacer thickness weakens interlayer coupling, reducing coercivity and Curie temperature.
  • Enhanced anomalous Hall response observed with increasing spacer thickness, particularly at n=4.

Conclusions:

  • Demonstrates reversible control of spin configuration via magnetic field.
  • Confirms magnetic proximity-induced exchange coupling dictates the magnetic ground state.
  • Highlights atomic-scale spacer engineering for spintronic applications and tunable topological phases.