Abstract：There is an increasing demand for permanent magnets with high temperature stability. Magnets are usually heated for a short time above the operating temperature to ensure its performance stability during the long-term application, however, this will inevitably lead to an initial remanence loss. Here the initial remanence loss after short-term high temperature heating was studied by experiments and computer simulation. The initial remanence loss is caused by the reverse domainand concentrated in the two polar layers of the magnet, which is due to the non-uniform demagnetizing field. Based on this demagnetization mechanism, it is proposed that the initial remanence loss of the magnet can be effectively reduced by simulating the magnetic circuit environment during the actual application of the magnet, so that the magnet can maintain a high initial magnetic property, and at the same time, it can ensure the stability of the performance during the long-term use. In the process af pre-stabilized, the magnetic circuit is simulated by contact with iron sheet, which can effectively reduce the initial remanence loss, maintain a high initial magnetic property, and ensure the performance stability in the long-term application.
2022, Vol. 29 