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The loss density of the nanocrystalline material is experimentally characterized up to 500 kHz and above 1 Tesla in this paper. Flux density and loss density of the material under high operating temperature (150Â°C) are calibrated and reported. The core preparing effect on magnetic loss density is also identified by experiments, which provides information necessary to practical magnetic designs. A new empirical core loss calculation method has been proposed and verified for the nanocrystalline material under resonant operations that are popular in high-frequency power converter applications.