Ferrite oxide magnetic material

A resin-molded chip inductor comprising:

• a core made from a ferrite oxide magnetic material containing basic composition and subsidiary components,
• said basic composition essentially consisting of:
• 11 to 19 mol % of iron oxide calculated in terms of Fe2O3;
• 11 to 25 mol % of zinc oxide calculated in terms of ZnO;
• 0 to 10 mol % of copper oxide calculated in terms of CuO;
• and
• a residual part of nickel oxide;
• said subsidiary components including:
• 0.01 to 15 wt % of lead oxide calculated in terms of PbO;
• and
• 0.01 to 15 wt % of at least one of silicon oxide and talc calculated in terms of SiO2;
• wherein said ferrite oxide magnetic material having an initial magnetic permeability of not higher than 8, a sintered density of not lower than 4.8 g/cm3 and a stress-resisting and magnetic-field-resisting characteristic in a range of ±5% calculated in terms of the rate ΔL/L of the change of inductance due to the condition of a magnetic field of 1000 G under a compressive stress P=5 (kg/mm2) parallel with a direction of magnetization.