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This paper deals with the theoretical investigation of the effect of Hall   currents on the thermal stability of a ferromagnetic fluid heated from below   in porous medium. For a fluid layer between two free boundaries, an exact   solution is obtained using a linearized stability theory and normal mode   analysis. A dispersion relation governing the effects of medium permeability,   a uniform horizontal magnetic field, magnetization and Hall currents is   derived. For the case of stationary convection, it is found that the magnetic   field and magnetization have a stabilizing effect on the system, as such   their effect is to postpone the onset of thermal instability whereas Hall   currents are found to hasten the onset of thermal instability. The medium   permeability hastens the onset of convection under certain conditions. The   principle of exchange of stabilities is not valid for the problem under   consideration whereas in the absence of Hall currents (hence magnetic field),   it is valid under certain conditions

Hall effect on thermal stability of ferromagnetic fluid in porous medium in the presence of horizontal magnetic field