If you need pulling power outdoors, then you should use ferrite magnets. But also when you need magnets that can withstand high temperatures of up to 200°C. Ferrite is in contrast to neodymium Ferrite is a lot cheaper. So if you do not need a lot of holding power, ferrite magnets are the cheapest option!
The different shapes of ferrite magnets are more limited than those of our neodymium magnets. The shown magnets are just a selection from our assortment. If you need different shapes or dimensions, please know that we will be happy to help you.
What is ferrite?
All our modern ferrite materials are polycrystalline (consist of a large number of small crystals) and have a spinel structure. The general composition of ferrites is MeFe2O4, where Me is one or more of the divalent metals manganese, zinc, nickel, cobalt, copper, iron or magnesium. The most commonly used ferrites are manganese zinc and nickel zinc.
The normal spinel structure consists of 32 oxygen ions and 24 cations, of which eight are divalent surrounded by 4 oxygen ions (the tetrahedron positions, A) and sixteen are trivalent surrounded by 6 oxygen ions (the octahedron positions, B).
There is a strong interaction between the spin of the metal ions of the A and B positions, which align in opposite directions. However, the magnetic fields only partially cancel each other out, an essential property of ferrimagnetic materials. An important fact is further that the divalent non-magnetic zinc ions can occupy the B-positions of the trivalent Fe3+, with the Fe3+ ions then being displaced to the A-positions. By changing the ratio of the original materials, magnetic properties such as curie temperature, saturation point, and losses can be varied within very wide limits, although improvement of one property is almost always at the expense of deterioration of another. By adding very small amounts of other elements or oxides and by optimal production process settings progress in the combination of magnetic properties is still being made.