What is the Curie temperature?
Using this feature, people developed many control elements. For example, we use the rice cooker on the use of magnetic properties of Curie point. In the center of the bottom of rice cooker with a magnet and a Curie point magnetic material is 105 degrees. When the pot of water after the dry, the temperature of the food 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.
The Curie temperature refers to the material can change between the magnet and the magnet temperature is lower than the Curie temperature. The material becomes ferromagnetic magnetic field at this time and the relevant materials are difficult to change. When the temperature is higher than the Curie temperature, the material becomes paramagnetic, the magnetic field is very easy to change with the change of the magnetic field. Magnetic sensitivity is about 6 negative 10.
For all of the magnetic material, and not at all temperatures are magnetic. Generally, the magnetic material has a critical temperature Tc, the temperature above, due to the severe high temperature thermal motion of atoms, atomic magnetic moment arrangement was disordered. Under this temperature, the atomic magnetic moment order, spontaneous magnetized objects become ferromagnetic.
