  The natural van der Waals superlattice MnBi2Te4-(Bi2Te3)m provides an optimal
platform to combine topology and magnetism in one system with minimal
structural disorder. Here, we show that this system can harbor both
ferromagnetic (FM) and antiferromagnetic (AFM) orders and that these magnetic
orders can be controlled in two different ways by either varying the Mn-Mn
distance while keeping the Bi2Te3/MnBi2Te4 ratio constant or vice versa. We
achieve this by creating atomically engineered sandwich structures composed of
Bi2Te3 and MnBi2Te4 layers. We show that the AFM order is exclusively
determined by the Mn-Mn distance whereas the FM order depends only on the
overall Bi2Te3/MnBi2Te4 ratio regardless of the distance between the MnBi2Te4
layers. Our results shed light on the origins of the AFM and FM orders and
provide insights into how to manipulate magnetic orders not only for the
MnBi2Te4-Bi2Te3 system but also for other magneto-topological materials.
