Solidification of giant magnetostrictive materials TbFe 1.9 , DyFe 1.9 , and Tb 0.3 Dy 0.7 Fe 1.9 in a magnetic field has been investigated. Suppressing the turbulence in the melt is a key factor in texturing the magnetic materials. Those factors which influence convective flow during the course of solidification are discussed, and a critical Rayleigh number Ra c can be used to reflect the state of turbulence at various cooling rates. Once the value of Ra c in a magnetic field is larger than that of the practical Rayleigh number Ra in the melt, the temperature oscillations will be restrained, and the texture along the easy magnetic axis for those ferromagnetic materials will be dominant in the sample.