“…With the development of the miniaturization of electronic devices, low-dimensional magnetism becomes a research hotspot. 5 In the early stages, nano-scaled magnetic materials with atomic thickness are usually prepared in traditional thin film technology, such as electron beam evaporation, magnetron sputtering, molecular beam epitaxy, pulsed laser deposition, thermal evaporation, 6 , 7 , 8 , 9 etc. The essence of these techniques is to deposit three-dimensional (3D) magnetic block material on the substrate to obtain magnetic thin films with two-dimensional (2D) geometric morphology.…”