POWER APPLICATIONS.

METALLIC GLASSES FILL A MATERIALS GAP BETWEEN NICKEL-IRON SOFT MAGNETIC ALLOYS (THE PERMALLOYS) AND SOFT FERRITES. THEY SHOW HIGH RESISTIVITY AND COMPARABLE OR GREATER MAGNETIZATION RELATIVE TO THE FORMER AND LOWER RESISTIVITY BUT AT LEAST TWICE THE SATURATION INDUCTION OF THE LATTER. IN PARTICULAR, METALLIC GLASSES SHOW OUTSTANDING PROMISE AS A LOW LOSS, HIGH-MAGNETIC-INDUCTION CORE MATERIALS FOR THE GROWING HIGH-FREQUENCY, HIGH-POWER APPLICATIONS MARKETS. HOWEVER, PROBLEMS EXIST WITH LOSS RESONANCES IN TOROIDS OF CERTAIN GLASSY ALLOYS. WHILE THE LOSSES ARE KNOWN TO ORIGINATE FROM MAGNETOELASTIC INTERACTIONS, THE EXACT MODE OF COUPLING IS NOT DESCRIBED IN THE LITERATURE. WE HAVE A MODEL OF THE COUPLING WHICH, IF PROVEN TO BE CORRECT, SHOULD AID IN DESIGNING TRANSFORMER CORES OF LOWER LOSS. MORE IMPORTANTLY, WE PROPOSE A SIMPLE SERIES OF MEASUREMENTS WHICH SHOULD INDICATE WHETHER THE BETTER WAY WAY TO AVOID THESE LOSSES IS THROUGH USE OF A NON-MAGNETOSTRICTIVE, COBALT-BASE GLASS (WHICH NECESSARILY HAS LOWER SATURATION INDUCTION THAN IRON-BASE GLASSY ALLOYS) OR THROUGH MORE CAREFUL HEAT TREATMENT OF THE HIGHER INDUCTION BUT MAGNETOSTRICTIVE IRON-BASE AMORPHOUS ALLOYS. SPECIFICALLY, WE PROPOSE TO FABRICATE AMORPHOUS ALLOYS OF LOW MAGNETOELASTIC COUPLING AND TO COMPARE THEIR PERFORMANCE WITH THAT OF COMMERCIALLY AVAILABLE MAGNETOSTRICTIVE AMORPHOUS COMPOSITIONS. THE COMPARISON IS EXPECTED 1) TO CONFIRM THE WIDELY ACCEPTED BELIEF THAT THE LOSSES ARE PRESENT ONLY IN MAGNETOSTRICTIVE COMPOSITIONS, 2) TO SUPPORT OUR MODEL IN WHICH THE LOSSES ARE A FUNCTION OF THE EQUILIBRIUM DOMAIN CONFIGURATION, AND 3) TO GIVE A FIRST INDICATION OF WHETHER IT IS BETTER TO USE A NON-MAGNETOSTRICTIVE GLASSY ALLOY OR TO TRY TO HEAT TREAT THE MAGNEOSTRICTIVE GLASSY ALLOY IN SUCH A WAY THAT THE MAGNETOELASTIC LOSSES ARE MINIMIZED.