Strong magnet is also called neodymium iron boron magnet. This is a man-made permanent magnet, a strong magnet because it is by far the most powerful permanent magnet. General in some specific places to use a strong magnet in Shenzhen. A typical magnetic material has a critical temperature Tc above which it is demagnetized or demagnetized. As the temperature rises, their internal molecular heat moves faster and faster. When the temperature rises to a certain value, the intense molecular heat movement destroys the regularity of the direction of the electron movement and the magnetism of the magnet disappears.