Abstract: First, Fe80.8Si7.2B6Nb5Cu amorphous strip was prepared by melt spinning method, then after annealing, grinding, molding, annealing and a series of processing, the Fe80.8Si7.2B6Nb5Cu amorphous-nanocrystalline magnetic powder core with compact microstructure was obtained.The basic properties of magnetic powder core, such as micro morphology, magnetic permeability, power loss, quality factor, and so on were studied.The results show that Fe80.8Si7.2B6Nb5Cu amorphous-nanocrystalline duplex magnetic core has high permeability (36-37), and relatively stable in different frequency and magnetic field, and at low frequency (less than 200 kHz), when the magnetic field is less than 50 mT, the maximum power loss is only 49.42 W/kg;futhermore, it has good quality factor.

Key words: First, Fe80.8Si7.2B6Nb5Cu amorphous strip was prepared by melt spinning method, then after annealing, grinding, molding, annealing and a series of processing, the Fe80.8Si7.2B6Nb5Cu amorphous-nanocrystalline magnetic powder core with compact microstructure was obtained.The basic properties of magnetic powder core, such as micro morphology, magnetic permeability, power loss, quality factor, and so on were studied.The results show that Fe80.8Si7.2B6Nb5Cu amorphous-nanocrystalline duplex magnetic core has high permeability (36-37), and relatively stable in different frequency and magnetic field, and at low frequency (less than 200 kHz), when the magnetic field is less than 50 mT, the maximum power loss is only 49.42 W/kg;futhermore, it has good quality factor.