After the magnet attracts the mold, how to go to the magnetic?
Below the Curie temperature, the substance becomes ferromagnetic, when the magnetic field associated with the material is difficult to change. When the temperature is higher than the Curie temperature, the material becomes a paramagnetic material, and the magnetic field of the magnet changes easily with the change of the surrounding magnetic field. The magnetic susceptibility is about 10 minus 6 times. 80 degrees is not enough, now the universal access card use electric magnet, if enough 80 thief only need to take a pot of boiling water can be, you can be heated to about 200 degrees if not, don't heat may cause damage to the magnet or accident still remember the Magdeburg hemisphere ^hehe.
We use the rice cooker to take advantage of the Curie dot properties of the magnetic material. At the bottom of the rice cooker, a magnet is placed in the center and a magnetic material with a Curie point of 105 degrees. When the pot of water after the dry food, the temperature will rise from 100 degrees. When the temperature reaches about 105 degrees, due to magnetic material of the magnet magnet disappeared, it lost the suction, then the springs between the magnets and magnetic materials to separate them, and drive the power switch is disconnected, stop heating. Curie temperature is the temperature at which material can change between a ferromagnet and a magnet
The Curie temperature is not magnetic at all temperatures for all magnetic materials. Generally, a magnetic material has a critical temperature Tc, at which the arrangement of atomic magnetic moments is disordered due to the intense thermal motion of atoms at high temperatures. Below this temperature, the magnetic moment of the atom is arranged in order, producing spontaneous magnetization, and the object becomes ferromagnetic. With this feature, a number of control components have been developed.
