Twist-stacked 2D bilayer Fe3GeTe2 with tunable magnetism

The crystal structure of bulk Fe 3 GeTe 2 (a); the side views of (b) the 0° and (c) the 180° twist-stacked Fe 3 GeTe 2 bilayers, as well as the top views of (d) the 0° and (e) the 180° twist-stacked bilayers.