Abstract
Magnetic properties of Pt–Co alloys near the equiatomic composition have been investigated in detail. Double aging, consisting of the first aging at an intermediate temperature (680°∼720°C) and the second aging at a lower temperature (600°C), was found to very effectively increase the coerctive force, and it yielded the maximum energy product (B·H)max of 12.5×106 G·Oe.
