Fe-BASED NANOCRYSTALLINE ALLOY CORE AND METHOD FOR PRODUCING Fe-BASED NANOCRYSTALLINE ALLOY CORE

摘要

A core is obtained by winding an Fe-based nanocrystalline alloy ribbon, the core having an impedance relative permeability µrz of 90,000 or more at a frequency of 10 kHz, 40,000 or more at a frequency of 100 kHz, and 8,500 or more at a frequency of 1 MHz. The Fe-based nanocrystalline alloy core is produced through a heat treatment step which includes a magnetic field application step of applying a magnetic field in a height direction of the core for not less than 10 minutes and not more than 60 minutes, within only a temperature range in a period of temperature elevation spanning from a temperature which is 25°C higher than a crystallization onset temperature by differential scanning calorimeter to a temperature which is 60°C higher than the crystallization onset temperature.