PART I. Fundamental OVERVIEW OF MAGNETIC NANOMATERIALS Introduction Classification of Typical Magnetic Nanomaterials Characterization of Magnetic Nanomaterials MAGNETISM OF NANOMATERIALS Introduction Magnetism and Spintronics Magnetic Properties of Magnetic Nanomaterials Magnetization Process Magnetic Anisotropy PART II. Synthesis OVERVIEW OF SYNTHESIS OF MAGNETIC NANOMATERIALS Introduction General Synthesis Mechanism of Magnetic Nanomaterials SYNTHESIS OF SOFT MAGNETIC NANOMATERIALS AND ALLOYS Introduction Metal Metals Oxides Metal Carbides, Nitrides Alloys and Beyond Conclusions and Perspectives SYNTHESIS OF RARE EARTH PERMANENT NANOCOMPOSITE MAGNETS Introduction SmCox-Based Magnets NdFeB-Based Magnets Conclusions and Perspectives SYNTHESIS OF RARE EARTH FREE PERMANENT MAGNETS Introduction FeNx MnB Others Conclusions and Perspectives SYNTHESIS OF MAGNETIC CHALCOGENIDES Introduction Synthesis Properties Conclusions and Perspectives SYNTHESIS OF TYPICAL MAGNETIC NANOSTRUCTURES Introduction Synthesis of Hollow/Porous Magnetic Nanoparticles ORGANIZED ENSEMBLES OF MAGNETIC NANOMATERIALS Introduction Essential Conditions for Ordered Structures Self-Assembly Method of Magnetic Nanomaterials PART III. Applications MAGNETIC NANOMATERIALS FOR BIOTECHNOLOGY Introduction Magnetic Nanomaterials for Biosensors Magnetic Nanomaterials for Bioseparation Conclusions and Perspectives MAGNETIC NANOMATERIALS FOR DIAGNOSTICS Introduction Biocompatibility of Magnetic Nanoparticles Surface Functionalization of Magnetic Nanomaterials Magnetic Resonance Imaging (MRI) Magneto-Acoustic Tomography (MAT) Magnetic Particle Imaging (MPI) Multi-Modality Imaging Conclusions and Perspectives MAGNETIC NANOMATERIALS FOR THERAPY Introduction Imaging-Guided Therapy Magnetic Hyperthermia Targeted Drug and Gene Delivery Conclusions and Perspectives MAGNETIC NANOMATERIALS FOR DATA STORAGE Introduction Monodisperse Magnetic Nanoparticles Magnetic Nanoparticle Assembly Conclusions and Perspectives MAGNETIC NANOMATERRIALS FOR ELECTROMAGNETIC WAVE-ABSORBING Introduction Advantage of Magnetic Absorbing Nanomaterials Theoretical Research Magnetic Absorbing Nanomaterials Conclusions and Perspectives MAGNETIC NANOMATERIALS FOR WATER REMEDIATION Introduction Magnetic Adsorption Nanomaterials and Mechanism Removal of Toxic Metal Ions and Dye