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4 types of permanent magnets: Alnico Ferrite SmCo NdFeB

Time:2023-11-24 Edit:WZ Magnetics

Permanent magnets are materials that retain their magnetism over long periods without the need for an external magnetic field. Four common types of permanent magnets are Alnico, Ferrite, SmCo (Samarium Cobalt), and NdFeB (Neodymium Iron Boron). Let’s compare these magnets in terms of their composition, properties, and applications:

With continuous exploration and research, With the continuous evolution of magnet development, we have discovered a variety of permanent magnets.

Following are different types of rare earth magnets:

Alnico (Aluminum-Nickel-Cobalt-Iron)Ferrite (Ceramic)SmCo (Samarium Cobalt)NdFeB (Neodymium Iron Boron)
HistorySince 1930’sSince 1950’sSince 1960’sSince 1980’s
Manufacture processCasting, SinteringSintering, Injection moldingSinteringSintering, Injection molding
AdvantagesHigh working temperature,
No coating needed
Low weight,
No coating needed,
Cheap price
High energy
High working temperature
No coating needed
Super-high energy
DisadvantagesEasily demagnetized,
Low energy
Low energy,
Brittle
Expensive price,
brittle
Easily oxidized,
Low working temperature
Currie Temperature700-860℃450℃720-800℃310-400℃
Max. Working temperature525℃250℃350℃80℃ - 200℃
Density7.3 g/cm³4.8 g/cm³8.4 g/cm³7.5 g/cm³
CompositionsAlnico magnets are made primarily from aluminum (Al), nickel (Ni), cobalt (Co), and iron (Fe), along with small amounts of other elements like copper and titanium.Ferrite magnets are composed of iron oxide (Fe2O3) and strontium or barium carbonate (Sr/BaCO3)SmCo magnets are made of samarium (Sm) and cobalt (Co), with traces of other elements like iron and copper.NdFeB magnets consist of neodymium (Nd), iron (Fe), and boron (B), along with small amounts of other elements like dysprosium and terbium for enhanced performance.
4 types of permanent magnets: Alnico Ferrite SmCo NdFeB

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