Ceramics / Glass – Ferrites | NETZSCH Grinding & Dispersing

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Ferrites

General Information

Ferrites, which can be classified as soft and hard ferrites, are oxide ceramic materials with the general composition M^IIO•Fe₂O₃, which contain permanent magnetic dipoles. The special magnetic properties are due to the spontaneous parallel or inverse parallel position of the magnetic moments of the atoms in larger areas.

Soft Ferrites
A multitude of magnetically soft materials of the composition M^IIO•Fe₂O₃ is known today, where M = Fe can be Ni, Co, Mn, Mg, Cu, Ti, Cd or Zn. In practice however, two mixed ferrites have proven to be of particular value: manganese-zinc and nickel-zinc ferrites. The addition of zinc-ferrites enables systematic manipulation of the magnetic properties of a material.

Typical applications for soft ferrites:

Core material for inductors and transformers in power electronics
Ferrite antennae in radio, television, data and telecommunications technology
Magnetic audio heads or magnetic amplifiers
Ferrite cores for core memory in electronic data processing equipment
Switching elements in microwave engineering

Hard Ferrites
Since their introduction in the early 1950s, permanent ceramic ferrite magnets have steadily gained in importance. They are the most economical and most prevalent of all magnetic materials worldwide. Some of the most important hard ferrites are barium ferrite, strontium ferrite and the barium-strontium mixed ferrites.

Typical applications for hard ferrites are found in:

Industrial electronics
Sensor technology
Television and radio technology
Loudspeaker magnets
Magnetic clamps, adhesive magnets or toy magnets
Ring magnets or segment magnets in motors and generators for magnetic clutches
Automotive industry, automotive engineering
Clock and watch industry
Household appliances, refrigerator seals
Rotors for direct current motors

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