Patent ID: 6905629

Claim:
An Mn—Zn ferrite wherein from 0 to 5000 (note that 0 is not include of a Co oxide in a Co 3 O 4 conversion is contained in a basic component constituted by Fe 2 O 3 : 51.5 to 57.0 mol % and ZnO: 0 to 15 mol % (note that 0 is not included) wherein the rest is substantially constituted by MnO; wherein a value α in a formula (1) below in said ferrite satisfies α≧093, α=((Fe 2+ −Mn 3+ −Co 3+ )×(4.29 ×A 1.91 ×B+ 2.19 ×C+ 2.01 ×D ))/(( A−B−C−D )×100) formula (1) wherein the formula (1), (Fe 2+ −Mn 3+ −Co 3+ ):[wt %], A: Fe 2 O 3 [mol %], B: MnO [mol %], C: ZnO [mol %] and D: CoO [mol %].