Ferrite-magnet – sintered
Hard ferrite are performed as barium ferrite (BaFe) and Strontium ferrite (SrFe). Hard ferrite are low-cost magnets with good magnetic properties.
Hard ferrite has a similar hardness and brittleness to ceramic materials, so it is workable only with a diamond tool. As is typical of oxide ceramics, hard ferrite magnets display relatively resistant behavior towards moisture, solvents, alkaline solutions, weak acids, salts, lubricants and gas pollutants.