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We have measured the isothermal field dependence of magnetization of theMo$_{100-x}$Re$_x$ (15 $\leq$ x $\leq$ 48) alloys, and have estimated thecritical current and pinning force density from these measurements. We haveperformed structural characterization of the above alloys using standardtechniques, and analyzed the field dependence of critical current and pinningforce density using existing theories. Our results indicate that dislocationnetworks and point defects like voids and interstitial imperfections are themain flux line pinning centres in the Mo$_{100-x}$Re$_x$ alloys in theintermediate fields, i.e., in the small bundle flux line pinning regime. Inthis regime, the critical current density is also quite robust againstincreasing magnetic field. In still higher fields, the critical current densityis affected by flux creep. In the low field regime, on the other hand, thepinning of the flux lines seems to be influenced by the presence of twosuperconducting energy gaps in the Mo$_{100-x}$Re$_x$ alloys. This modifies thefield dependence of critical current density, and also seems to contribute tothe asymmetry in the magnetic irreversibility exhibited by the isothermal fielddependence of magnetization

Magnetic irreversibility and pinning force density in the Mo$_{100-x}$Re$_x$ alloy superconductors