What is the average flux loss in newly magnetized permanent magnets?
The magnetic domains are locked in position as established by initial magnetization. The domains are held in place until acted upon by forces exceeding the locked in force. Various factors affecting magnet stability include metallurgical changes, time, temperature, reluctance changes, adverse fields, shock, stress and vibration as quoted from Indiana General. Metallurgical: In the older magnets such as cobalt, tungsten or chromium-steels, metallurgical changes may take place at or near room temperature as a function of time. It is important to note that metallurgical changes do not take place in any measurable degree at room temperature in the newer permanent magnets such as Alnico or Ceramic. IG Time: Time versus flux records made by precise lab measurements, under carefully controlled conditions have shown that a newly magnetized magnet will lose a minor percent of its flux as a function of age . IG Temperature: 1. Metallurgical changes occur in magnets exposed to very high temperatu
