There are various types of permanent magnets that vary in their strength, qualities and costs.
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Composition
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Term
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Comment
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neodymium iron boron
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NIB, NdFeB
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rare earth magnet; very strong magnetic field; not easily demagnetized; low mechanical strength; brittle; corrodes (oxidizes) if not coated
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samarium cobalt
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SmCo
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rare earth magnet; very strong magnetic field; not easily demagnetized; low mechanical strength; temperature resistant; oxidation resistant
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aluminum nickel cobalt
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Alnico
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formed by sintering or casting; good temperature resistance; easily demagnetized
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iron oxide (with barium or strontium carbonate)
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ceramic or ferrite
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formed by sintering; strong magnetic field; not easily demagnetized; brittle
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where:
• Rare earth magnets are made from the lathanoid series of elements.
• Sintering involves application of heat and pressure.
