magnetic

magnetic has different types , generally divided into hard magnet and soft magnetic (relatively short period of time magnetic) two categories, we are talking about magnets, generally refers to the permanent magnet magnet. Permanent magnet is divided into two major categories: the first category are: metal alloy magnets, including NdFeB magnet Nd2Fe14B), samarium-cobalt magnets (SmCo), Alnico magnets (ALNiCO) The second category are: ferrite permanent magnetic materials.