How NdFeB Magnets Are Tested: Surface Field, Flux, Magnetic Moment, and Density Today, we will focus on the principles and methods used for relative magnetic property testing of sintered NdFeB magnets. NdFeB products come in many different shapes and sizes, and while most customers specify the magnetic grade, some also request comparative magnetic performance tests on samples. Typical customer requests may include: checking the surface magnetic field, measuring the magnetic flux, or verifying the magnetic moment of selected magnets. To

Origin of Magnetism in Permanent Magnets The magnetic properties of permanent magnets primarily come from their crystal structure, which allows them to become strongly magnetized. Even after the external magnetic field is removed, the magnet retains its magnetism. Therefore, the magnetization process (also called charging or polarization) is a critical step for permanent magnetic materials such as NdFeB (Neodymium-Iron-Boron) to obtain and exhibit strong magnetism. Isotropic vs. Anisotropic Magnets Magnetic materials can be classified into isotropic and anisotropic magnets: Type