Neodymium magnets, a member of the rare earth magnet family, are well known for being the strongest magnets available. However, compared to samarium cobalt rare earth magnets, SmCo Magnets do not have the same tolerance for high temperatures. Samarium cobalt magnets have a working temperature of up to 300°C, but standard neodymiums only have a working temperature of up to 80°C, at which point they begin to lose their magnetic strength. Because samarium cobalt magnets are also members of the rare earth magnet family, they are still very strong, and significantly stronger than ceramic and alnico magnets. However, samarium cobalt magnets cannot deliver the same strength as neo magnets. To address the need for neo magnets in applications with maximum temperatures exceeding 80°C, high temperature neodymium magnets have been developed.
It should not be implied that neodymium magnets are easily demagnetized, as they (like other rare earth magnets) have an excellent resistance to demagnetization. If a neo magnet is dropped or exposed to other magnets, it will not lose its magnetic strength.
However, if a neodymium magnet is heated above its Curie temperature, it will completely lose its magnetization. Additionally, as a neodymium magnet is heated to temperatures approaching its Curie temperature, it will gradually lose magnetization and become progressively weaker as temperatures increase. Neodymium magnets also lose their resistance to demagnetization as they are heated above room temperature.
High Temperature Neodymium Magnets vs. Samarium Cobalt Magnets
Samarium cobalt magnets, with their higher working temperature, are commonly used in applications where neo magnets are unable to tolerate higher temperatures. However, samarium cobalt magnets do not always meet the strength requirements demanded by certain applications. To resolve this issue, high temperature neodymium magnets have been developed.
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