Two-dimensional (2D) magnetic materials are essential for the development of next-generation spintronic technologies. Recently, layered van der Waals (vdW) compound MnBi2Te4 (MBT) has attracted great interest, and its 2D structure been reported to host coexisting magnetism topology. Here, we design several conceptual nanodevices based on MBT monolayer (MBT-ML) reveal their spin-dependent transp...