| 摘要 |
Provided is an Fe-based nanocrystalline alloy core that is obtained by winding an Fe-based nanocrystalline alloy ribbon and that has a core 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 that includes a magnetic field application step in which a magnetic field is applied in the height direction of the core for 10-60 minutes, within a temperature range during a heat increase period corresponding to 25 °C above the crystallization onset temperature to 60 °C above the crystallization onset temperature according to a differential scanning calorimeter. |
