3 Types of Neodymium Magnets You Might Not Know Neodymium magnets, also called NdFeB magnets, are tetragonal crystals formed by neodymium, iron, and boron. According to different production processes, they can be divided into three types: sintered NdFeB magnets, bonded NdFeB magnets, and hot-pressed NdFeB magnets. Due to the different production processes, they have big differences in