Why do sintered neodymium magnets maintain excellent magnetic properties at high temperatures?

A magnetic domain is a tiny area with a consistent magnetization direction inside a magnet. A domain wall is an area where the magnetization direction gradually transitions between adjacent domains. Under the influence of an external magnetic field or temperature, the domain wall moves, causing the magnetization state of the magnet to change. For ordinary magnets, the movement of the domain wall intensifies under high temperature conditions, making the magnetization state unstable, thus affecting the magnetic properties of the magnet.

However, sintered neodymium magnets exhibit completely different characteristics at high temperatures. Its unique Nd2Fe14B tetragonal crystal structure inhibits the movement of the domain wall at high temperatures. This is because the crystal structure of sintered neodymium magnets has high thermal stability, which can maintain the stability of the domain wall at high temperatures, thereby maintaining the stability of the magnetization state.

Under high temperature conditions, the movement of the domain wall of sintered neodymium magnets is inhibited, allowing their magnetization state to be maintained. This characteristic enables sintered neodymium magnets to still exhibit excellent magnetic properties at high temperatures. Specifically, even under high temperature conditions, the key magnetic performance indicators of sintered neodymium magnets, such as magnetic energy product, coercive force and remanence, can still be maintained at a high level, thus meeting the needs of various high-performance applications.

The characteristic of sintered neodymium magnets to maintain stable magnetic properties at high temperatures makes them widely used in many fields. For example, in equipment such as motors, generators and sensors in high temperature environments, sintered neodymium magnets can provide a stable magnetic field to ensure the normal operation of the equipment. In addition, sintered neodymium magnets also perform well in applications under extreme conditions such as aerospace and nuclear energy, providing strong support for the development of these fields.

With the advancement of science and technology and the continuous optimization of preparation processes, the high-temperature stability of sintered neodymium magnets is expected to be further improved. In the future, sintered neodymium magnets will play an important role in more applications under high temperature and extreme conditions, and make greater contributions to scientific and technological progress and social development.