Explanation

Also called ferrite magnetism. ferrimagnetism usually occurs in iron oxides and ferritic materials. Before French scientist Louis Nair discovered | materials in 1948, people often regarded ferromagnetic materials and ferromagnetism! materials are confused. There are many atoms with opposite magnetic moment in ferromagnetic materials. However, these mutually opposite magnetic moment are not equal, which makes the materials show the phenomenon of overall spontaneous magnetize. Similar to ferromagnetic materials, the magnetization of ferromagnetic materials also changes with the ambient temperature. When the temperature is lower than the Curie temperature, the spontaneous magnetize appears, and when the temperature is higher than the Curie temperature, the spontaneous magnetize disappears. Different from ferromagnetic materials, ferromagnetic materials! Below the Curie temperature, there may also be a temperature critical point called magnetize compensation point. At this temperature, the magnetic moment of the two spins are exactly equal, making the total magnetic moment of the materials zero. For some materials, there may also be another magnetize compensation point, and the net angular momentum of the materials system becomes zero at this temperature. Ferromagnetic materials with such compensation points have high-speed magnetic reversal effect, which is of great significance for the preparation of magnetic memory devices.

Classification