We present a formula for tunneling conductance in ballisticferromagnet/ferromagnetic insulator/superconductor junctions where thesuperconducting state has opposite spin pairing symmetry. The formula caninvolve correctly a ferromagnetism has been induced by effective massdifference between up- and down-spin electrons. Then, this effective massmismatch ferromagnet and standard Stoner ferromagnet have been employed in thispaper. As an application of the formulation, we have studied the tunnelingeffect for junctions including spin-triplet p-wave superconductor. Theconductace spectra show a clear difference between two ferromagnets dependingupon the way of normalization of the conductance. Especially, a essentialdifference is seen in zero-bias conductance peaks reflecting characteristics ofeach ferromagnets. From obtained results, it will be suggested that themeasurements of the tunneling conductance in the junction provide us a usefulinformation about the mechanism of itinerant ferromagnetism in metal.
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