Loss and Permeability of Partially Crystallized Amorphous Cores under DC-Biased Field

概要

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Magnetic cores with the permeability of approximately 150 were prepared by annealing Metglas 2605S3A ribbons in an O_2 or N_2 atmosphere, and effect of DC-bias field on their magnetic properties was studied. The atomosphere during annealing did not affect resultant magnetic properties of the cores, and the low permeability was estimated to be achieved by the partial crystallization and the resultant change in magnetization mode to the magnetization rotation mode. The fraction of crystallized part was estimated to be approximately 15% in weight. A decrease in AC-permeability due to an application of DC-bias field was smaller than of a Mn-Zn ferrite core with air-gap (μ=120) but larger than that of a Mo permalloy powder core (μ=130). The core loss, which is comparable with that of a Co-based amorphous cut core (μ=200) and a Sendust powder core (μ=100), decreased with increasing the magnitude of DC-bias field at low frequencies such as 10kHz and increased at high frequencies such as 150kHz. This increase may be attributed to in-plane eddy current loss at high frequencies.
社団法人日本磁気学会の論文
1999-01-20