The role of the magnetic plate

   Magnets can be grouped into "permanent magnet" and "non permanent magnets." The permanent magnet may be natural products, also known as natural magnet can also be manufactured by hand (the strongest magnets are neodymium magnets). samarium magnets the permanent magnet, and only in certain conditions be magnetic, usually produced in the form electromagnet, which is to strengthen the magnetic field by the current.
  It is the main raw materials include ferrite magnets BaFe12O19 and SrFe12O19. By law made of ceramic, texture rather hard, is a brittle material, due to ferrite magnets have good temperature resistance, low price, moderate performance, has become the most widely used permanent magnets.