Abstract
In order to determine the stability of magnetic properties, the remanence Br at high temperatures has been mainly investigated for Co-36%W and Co-26%Mo alloys subjected to heat treatment at various temperatures. A very small fluctuation of 0.3% in Br has been observed for 530 hr at 720°C in the former alloy and 2000 hr at 660°C in the latter. This result shows that these alloys have better stability in Br at higher temperatures than an Alnico-type alloy obtained by McCaig.
