Co-b a s e d a mo r p h o u s p o wd e r wa s p r o d u c e d b y a n e w a t o mi z a t i o n p r o c e s s " S p i n n i n g Wa t e r At o mi z a t i o n P r o c e s s ( S WAP ) " , h a v i n g b o t h rapid super-cooling rate and mass production potential. The composition of the alloys was ((Co0.95Fe0.05)1-xCrx)75Si15B10 (x=0, 0.025, 0.05, 0.075). The powders obtained were in the amorphous state at particle size up to 500 μ m and exhibited good magnetic softness. The coercive force of

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... was about 27.1-53.3 A/m. Furthermore, Co-based amorphous powder cores with glass binders were also fabricated by pressing and annealing methods. For the core pressed at 2 GPa in room temperature and annealed at 763 K ×15 min. in air, the initial permeability up to 100 kHz was about 110 and the core loss at 100 kHz for Bm=0.05 T was 85 kW/m 3 . Compared with Fe-based amorphous powder core, the former was 30 % higher and the latter was 40 % lower.