Abstract
In this chapter, we first introduce some established synthetic protocols toward magnetic-metallic nanocrystals (NCs) composed of single component metals (e.g., iron, cobalt, and nickel) and alloys (e.g., FePt, CoPt, FeCo, FeNi, and magnetic carbides). We mainly focus on colloidal chemical approaches such as thermal decomposition of organometallic precursors, chemical reduction of metal salts, sol–gel methods, reverse micelles, polyol process, and synergetic synthetic process. Current methods to protect magnetic-metallic NCs from oxidation and chemically etching, as well as their diverse magnetic properties are also discussed. Some promising biological applications of magnetic-metallic NCs are illustrated, especially in cancer diagnostic and therapy including magnetic resonance imaging (MRI), magnetic hyperthermia (MH), and ion releasing for selectively killing cells.
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