Patent ID: 8158018

Claim:
A ferrite sintered body containing: main components consisting of 52 to 54 mol % Fe 2 O 3 , 35 to 42 mol % MnO and 6 to 11 mol % ZnO as oxide equivalents; and additives including 1000×10 −6 to 3500×10 −6 parts by mass Co as CoO equivalent, 2100×10 −6 to 5000×10 −6 parts by mass Ti as TiO 2 equivalent, 50×10 −6 to 150×10 −6 parts by mass Si as SiO 2 equivalent and 300×10 −6 to 1500×10 −6 parts by mass Ca as CaCO 3 equivalent per 1 part by mass of the total mass of said oxides of said main components, wherein the temperature at which power loss is a minimal value is higher than 120° C. in a magnetic field with an excitation magnetic flux density of 200 mT and a frequency of 100 kHz, and the power loss at said temperature at which power loss is a minimal value is 350 kW/m 3 or less.