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Tunable interlayer magnetism and band topology in van der Waals heterostructures of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Mn</mml:mi><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> -family materials
Manipulating interlayer magnetic coupling (IMC) of van der Waals (vdW) magnets is the key to tailoring material properties for various electronic applications and fundamental studies. Using $\mathrm{Mn}{\mathrm{Bi}}_{2}{\mathrm{Te}}_{4}$-family materials as examples, we systematically investigate the constituent-element dependence of IMC by first-principles calculations and attribute the IMC to unusual long-range superexchange interactions …