The magnetic metal-organic frameworks (MMOFs) are a group of emerging novel functional nanomaterials, which are made up of MOFs and magnetic particles. Because of their high selectivity, excellent dispersivity, and recyclability, MMOFs have been widely used in environmental, medical and biological fields. In this paper, we give a short introduction to the synthesis methods of MMOFs, including embedding, layer-by-layer, encapsulation, and mixing methods. In the embedding method, pretreated magnetic materials are added to the precursor solutions of MOFs to form the magnetic particles embedded MMOFs. In the layer-by-layer method, MOFs accumulate around the functionally modified magnetic materials and form the layered MMOFs. In the encapsulation method, MOFs grow around the magnetic particles and then the magnetic particles are included into the MOFs. In mixing method, MOFs and magnetic materials are mixed and then form the complexes through physical or chemical processes. MMOFs, the coordinator of MOFs and magnetic particles, combine both the structural functions of MOFs and the magnetic features of magnetic particles, which can greatly enhance their application scope. For example, as MMOFs can carry and deliver specific drugs in biological systems, it can be potentially used for targeted drug delivery in biomedicine. Because MMOFs can accumulate and separate some guest compounds from a complicated environmental matrix, they have broad application prospects in the enrichment and detection of environment pollutants. In addition, MMOFs can be used as catalysts or catalyst support systems in various chemical reactions to enhance the efficiency.

Contents
1 Introduction
2 Magnetic metal-organic framework materials
2.1 Magnetic nanoparticles/nanorods
2.2 Preparation methods of magnetic metal-organic framework materials
3 Application of magnetic metal-organic framework materials
3.1 Biomedicine
3.2 Environmental pretreatment
3.3 Catalysis
4 Concluding remark and future trend