High frequency characteristics of annealed Co-base amorphous alloy ribbons
- Material Research Labortories, Industrial Technology Research Institute, Hsinchu 31015, Taiwan (Republic of China)
The rapidly quenched amorphous Co-base alloy Co{sub bal}Fe{sub 4}Ni{sub 2}Si{sub 15}B{sub 14} (Metglas 2714A) is a suitable material for the magnetic core operating in a high frequency. Appreciable reduction in core loss and increase in permeability of this material can be achieved by proper heat treatment. In this study, data from differential scanning calorimetry (DSC) and high frequency magnetic properties of samples annealed at different temperatures is presented. The results show that magnetic core loss at 50 kHz and 0.4 T decreases as annealing temperature ({ital T}{sub {ital a}}) increases from 400 to 753 K, and it reaches a minimum with an anomaly factor {eta} of 1.5 at annealing temperature of 753 K. Initial permeability {mu}{sub {ital i}} behaves more complicately and reach the maximum value of 24000 at the same temperature, which is 50 K lower than the crystallization temperature ({ital T}{sub {ital x}} = 823 K). This improvement of high frequency magnetic properties is attributed to the presence of small nuclei precipitated during heat treatment. The fraction of crystalline part in the amorphous matrix for optimum high frequency properties is 5%--6%, as estimated from the DSC data.
- OSTI ID:
- 5164472
- Journal Information:
- Journal of Applied Physics; (United States), Vol. 70:10; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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