Temperature change has a significant effect on the magnetism of neodymium magnets. The magnetic properties of NdFeB magnets change at different temperatures, as shown below:
Effect of high temperature:
As the temperature increases, the magnetic properties of NdFeB magnets are negatively affected. When the temperature reaches the Curie temperature of NdFeB, these magnets become very weak or even lose their magnetism. Generally speaking, the maximum operating temperature of NdFeB magnets is usually 80°C to 230°C, exceeding this temperature may cause irreversible loss of magnetic field strength. For example, the N series grade NdFeB products have a maximum operating temperature of 80~180℃, and the temperature of permanent loss of magnetism is 310℃.
Effect of low temperature:
At lower temperatures, NdFeB magnets perform better, and their magnetic properties become stronger and stronger as the temperature decreases. The minimum operating temperature of NdFeB magnets is about -138ºC (-216ºF), and they perform best at this temperature.
Coercivity and residual magnetic induction: As the temperature increases, the coercivity and residual magnetic induction of NdFeB magnets will gradually decrease, while the magnetic permeability will increase. This is because thermal energy will destroy the orderly arrangement of magnetic domains, thereby reducing the magnetic properties.
Saturation magnetization:
As the temperature increases, the saturation magnetization of NdFeB magnets will decrease. This is because, at high temperatures, the lattice vibration of the material increases, resulting in a decrease in magnetic properties.
Temperature coefficient: The intrinsic coercivity (Hci) of NdFeB magnets has a negative temperature coefficient as it changes with temperature, that is, the coercivity decreases with increasing temperature.
Temperature has a significant effect on the magnetic properties of NdFeB magnets. In high-temperature environments, the magnetic properties will decay or even demagnetize; while in low-temperature environments, the magnetic properties will be enhanced. Therefore, when using NdFeB magnets, it is necessary to consider their temperature sensitivity and avoid using them at too high or too low temperatures to maintain their optimal performance.