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Magnet demagnetize temperature
At what temperature do magnets demagnetize?
In physics, one declares all materials that have magnetic domains as magnets. These particular domains are to be understood as elemental magnets, i. they consist of many small equi-rectified electrons.
For magnetization to work, these elemental magnets (like tiny bar magnets) must point in the same direction. This happens, for example, when a strong magnetic field is introduced to the material (for example, ferromagnetic metal such as iron). The magnetic force bundles and radiates outwards.
However, there are several ways to demagnetize magnets, that is, to weaken their power or even cancel it altogether: one of them is to increase the temperature.
Which factors influence magnetic properties?
Of course, this depends greatly on the nature of the permanent magnet. Shocks such as impacts or eruptions do not affect all permanent magnets. For neodymium magnets this is not a real danger. Other permanent magnets, depending on the strength of their magnetic force, can not withstand the pressure and shed off, destroying the stable system of aligned electron spins.In addition to the vibration, a temperature increase is also suitable for demagnetizing magnets. Each magnet has a physical temperature range in which it retains its effect. This maximum operating temperature is called Curie temperature, named after the French physicist Pierre Curie. Here neodymium magnets are much more susceptible: at around 80°C they lose their magnetic effect.
Can magnets lose their power entirely?
They are usually not stored optimally. However, temporal decompositions can pose a great risk. For magnets, this is mainly the corrosion, ie rust. In order to optimize magnets against oxidation during production, the materials are mixed with specific chemical elements such as cobalt. An outer coating of nickel, epoxy or other materials can also provide longer-term protection.