Pernament Magnets

Permanent magnets are magnets made up of hard magnetic materials, able to keep the magnetic field from losing a magnetic field, and are used as a source of magnetic fields.

The characteristics of permanent magnets:

• Curie temperature: this is the maximum temperature at which ferromagnetic objects lose their magnetism. Curie temperature tells us the ability of the permanent magnet to work at high or low temperatures. There is a low Curie temperature type (such as Nd2Fe14B with Curie temperature of only 312 ° C), but there is also a type of magnet that works at high temperatures (e.g. SmCo with thousands of degrees Celsius, used in motors). jet, rocket …).
• Magnetic force: the limit at which a permanent magnet is demagnetized by an external magnetic field. Popularity today from 1000 Oe to tens of thousands of Oe.
• The maximum energy product
• Square or rectangular coefficients
• There are also hardness, ability to wear, oxidize, shape … determine the ability of the permanent magnet to work.
• Common types of permanent magnets