| abstract |
The present invention provides an Mn-Zn ferrite having a large resistance and capable of obtaining excellent soft magnetic properties in the high frequency region of exceeding 1MHz. The Mn-Zn ferrite contains less than 50 mol % Fe2O3 and a limited amount (0.5 mol % or less) of Mn2O3, such that an abnormal grain growth does not occur even if CaO content is more than 0.20 mass %, and a high electrical resistance (resistivity of more than1.5x10<SP>4</SP> (Ωm) and a surface resistance of more than1.5x10<SP>7</SP> (Ωm)) can be gained. And, since an appropriate amount of TiO2 and/or SnO2 is contained, an initial permeability is kept adequately high, whereby an excellent soft magnetism can be achieved in a high frequency band such as 1 MHz. |