Defect-driven ferrimagnetism and hidden magnetization in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>MnBi</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Te</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:math>

Abstract

MnBi${}_{2}$Te${}_{4}$ and MnSb${}_{2}$Te${}_{4}$ are the first examples of antiferromagnetic topological insulators. However, the presence of magnetic defects in the form of antisite mixing between Mn and Bi or Sb introduces defect-driven ferrimagnetism. The application of a large magnetic field of ~50 Tesla aligns the magnetic defects with the main Mn layer, allowing for estimates of the defect concentration and the strength of the antiferromagnetic coupling (${J}^{\ensuremath{'}}$) between Mn defects and the main layer, which is by far the largest magnetic coupling in the system.

Topics & Concepts