Everyone to know what a magnet is, however not all recognize magnetic properties and how lock are impacted by time, temperature, wear and external magnetic fields. Magnets room made native ferromagnetic materials and also have tiny magnetic domains. In the natural state, these domain names aren"t aligned and exhibit tiny if any magnetism. As soon as a solid magnetic field is applied, it forces alignment and the material becomes magnetic


Types that Magnet

Magnets deserve to be permanent, retaining their magnetic alignment ~ magnetism, or temporary, such together electro magnets that lose their magnetism once the magnetic field is removed. Various products exhibit magnetic nature including:

Iron:Used for electro magnets and also in a long-term magnet

Iron oxides:Haematite, magnetite and also ferric oxide.

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Nickel:Magnetic to moderate temperatures

Cobalt:Retains magnetism at high temperatures

Alloys:Certain alloys the iron, nickel or cobalt

Rare earth:Samarium and Neodymium magnets

Permanent Magnet

Permanent magnets are commonly manufactured native a mix of materials. Common varieties include:

Ferrite:Known as a ceramic magnet and made native strontium ferrite, cheap and corrosion-resistant but brittle and hard to machine. Usable come 250 °C.

Neodymium:Powerful neodymium magnets made from neodymium, iron and also boron, often plated or epoxy encased to improve corrosion resistance and restricted to 200 °C.


Plastic:A powdered long-term magnet bonded v thermoplastics. Great mechanical properties but restricted to 120 °C.

Magnet stay A magnet can wear out and this demands to be considered.

Factors that reason loss the magnetic nature include:

Erosion:Magnetic stamin is straight dependent on physical dimensions, therefore wear and also tear and pieces broken off result in less magnetic force. A ferrite magnet is an especially vulnerable to chipping.

Corrosion:Disrupts the physical structure by forcing magnetic domains apart and encouraging lock to shed orientation.

Elevated temperature:Magnetic materials lose magnetism together they heat, however they regain magnetism as soon as cooled noted the best temperature is listed below their Curie temperature. Over the Curie temperature, a magnet permanently loses every or several of its magnetism.

External magnetic fields:Strong, the contrary magnetic fields can cause the magnetic domains to lose their orientation and relax right into a lower state of energy where they space not aligned. This propensity can be diminished by adding materials that aid constrain magnetic domain names in the best orientation.

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Time:Although a magnet i do not care weaker end time, the rate of organic demagnetism relies on operation temperature and also external magnetic fields and takes numerous years detailed the magnet is kept listed below its maximum operating temperature.