Abstract
The Finemet-type nanocrystalline alloy represents an advanced soft-magnetic metal–metal-type nanocomposite with an eddy-current-determined high- frequency limit. A survey of different heat treatments under tensile stress is presented to tailor the hysteresis loop by induced transversal anisotropy. The flattened loop having reduced effective permeability enhances the eddy- current limit in the MHz region; For example, continuous stress annealing in a tubular furnace of 1 m length at 650°C, pulling the ribbon with a velocity of 4 m/min under a tensile stress of 200 MPa, results in a wound core having a permeability of 120 and a frequency limit of 10 MHz. Careful annealing preserves the static coercivity below 10 A/m. The power loss at 0.1 T and 100 kHz is only 82 mW/cm3, which is an order of magnitude lower then the values obtained for Sendust™ cores in similar conditions.
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Varga, L.K. High-Frequency Inductor Materials. J. Electron. Mater. 43, 117–120 (2014). https://doi.org/10.1007/s11664-013-2787-5
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DOI: https://doi.org/10.1007/s11664-013-2787-5