Curie temperature and demagnetization temperature of ferrite magnets

Addtime:2022-05-18 15:33:38 Click:25

What is the Curie temperature of a permanent ferrite magnet? What is the demagnetization temperature? Before answering this question, let's take a look at an introduction to the Curie temperature.

What is the Curie temperature?

Curie temperature refers to the temperature at which a material can change between a ferromagnet and a paramagnet. Below the Curie temperature, the substance becomes a ferromagnet, and the magnetic field associated with the material is difficult to change. When the temperature is higher than the Curie temperature, The substance becomes a paramagnet, and the magnetic field of the magnet is easily changed with the change of the surrounding magnetic field.

The picture is a multi-pole magnetized ring ferrite

multi-pole magnetized ring ferrite

What is the Curie temperature of a permanent magnet ferrite?

It is reported that the Curie temperature of ferrite is around 450°C, usually greater than or equal to 450°C, and the hardness is around 480-580.

How to demagnetize ferrite magnet?

If the ferrite is demagnetized, it is more troublesome, because the required temperature is very high, and if it needs to be demagnetized, it needs to be heated to 900 ℃ and reheated. Just above the Curie point is not clean. If you want to retreat, you can use the method of AC attenuation to demagnetize.

Curie temperature introduction of other magnets;

Maximum working temperature and Curie temperature of neodymium magnet


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