Remanence, coercivity, intrinsic coercivity and maximum magnetic energy product are the four most common parameters used to measure the properties of magnetic materials. In addition, we often see another two parameters in finished magnets -- surface magnetism and magnetic flux (also called magnetic flux).
Surface Magnetism
The simple understanding of surface magnetic is the magnetic induction intensity of the surface, which is defined as the magnetic flux through the unit area, so it is also called the surface magnetic flux density, the unit is Gaussian Gs or Tesla T, the measuring instrument is Gaussian meter or test instrument with Hall chip.
Table magnetic refers to a measuring point, but it is a small measurement of the value of the area, and the magnetic field distribution of the magnet is changing, so different points of the table magnetic is generally different. For the application field requiring the use of space magnetic field, the surface magnetic field or the magnetic induction value at a given point is usually regarded as an important technical requirement.
Table magnetic and magnet high diameter ratio (magnet height and diameter ratio, here the default height or thickness is magnetization direction of magnet), the higher the ratio of high diameter table magnetic higher, that is, the larger the surface area perpendicular to the direction of magnetization, the lower the table magnetic; The larger the magnetization direction size, the higher the surface magnetic. In addition, the Hall components on the Gauss meter of different manufacturers are different, and the table magnetism measured by the same magnet is also slightly different.