To provide low core loss Ni-Cu-Zn-based ferrite having a reduced rise in core loss due to a temperature change under an excitation condition of 1 to 5 MHz.
The Ni-Cu-Zn-based ferrite comprises, as the main components, 45 to 50.5 mol% Fe2O3, 14 to 24 mol% ZnO, 19.4 to 39 mol% NiO and 2 to 18.6 mol% CuO, and comprises, as auxiliary components, 0.01 to 0.6 wt.% V2O5, wherein the ratio of NiO/CuO is 1.2 to 19. The temperature change of core loss when an alternating current magnetic field of 1 to 5 MHz is applied to a sintered compact is continuously +0.1%/C (including negative value) at 25 to 60C. Alternatively, the above Ni-Cu-Zn-based ferrite has a C content of 450 ppm, sintered density of 5.30 g/cc, and an average crystal grain size of 0.3 to 5 m.
SATO TADAKUNI
CHATANI KENICHI
