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Black holes immersed in magnetic fields are believed to be important systemsin astrophysics. One interesting topic on these systems is their superradiantstability property. In the present paper, we analytically obtain thesuperradiantly stable regime for the asymptotically flat dyonicReissner-Nordstrom black holes with charged massive scalar perturbation. Theeffective potential experienced by the scalar perturbation in the dyonic blackhole background is obtained and analyzed. It is found that the dyonic blackhole is superradiantly stable in the regime $0<r_{-}/r_{+}<2/3$, where $r_\pm$are the event horizons of the dyonic black hole. Compared with the purelyelectrically charged Reissner-Nordstrom black hole case, our result indicatesthat the additional coupling of the charged scalar perturbation with themagnetic field makes the black hole and scalar perturbation system moresuperradiantly unstable, which provides further evidence on the instabilityinduced by magnetic field in black hole superradiance process.

Dyonic Reissner-Nordstrom Black Holes and Superradiant Stability