The effect of the form of the rotation curve on the dynamo growth rate ReΓ and oscillation frequency ImΓ of the fastest-growing magnetic field in the spherical halo. The shade of each curve corresponds to the value of the turnover radius of the rotation curve, s_v, with the lightest shade for s_v = 0.5 kpc and the darkest for s_v = 7.5 kpc with the increment of 1.75 kpc (the fiducial value is s_v = 3 kpc). Dashed curves are for the anti-symmetric eigenmodes and solid curves show symmetric solutions.