The effect of magnetic nanoparticles(MNPs) on the devitrification isothermal crystallization of typical vitrification solution Vs55 in the process of glass crystallization was systematically explored by Differential Scanning Calorimetry (DSC) and cryomicroscope system. The results show that:(1)The MNPs coated by both Carboxylic Acid (CA) and Polyethylene Glycol (PEG) have little effect on the glass transition temperature(Tg) of Vs55

but significant effect on the devitrification transition temperature(Td) and devitrification enthalpy(HTd);(2)At the range of the devitrification area (-85~-60℃)

the MNPs coated by CA can significantly promote the devitrification of Vs55 as increasing of the isothermal temperatures and the cooling rates

and the ice growth rate was 0.37 μm·s-1 at the isothermal temperature of -85℃

but it is about 2.19 μm·s-1 for -75℃. Also

the ice growth rates raised from 1.72 μm·s-1 to 3.54 μm·s-1 when the cooling rates were increased from 2℃·min-1 to 100℃·min-1(at the isothermal temperature of -75℃); (3) Compared with Vs55

magnetic nanoparticles coated by both PEG and CA could promote the devitrification of Vs55. The crystal growth rates at the isothermal temperature of -80℃ were 0 for Vs55

but 1.04 μm·s-1 and 2.31 μm·s-1 for CA and PEG respectively. Compared with CA coating

the MNPs coated by PEG promoted the much more devitrification of Vs55

and the ice growth rates were 0.62 μm·s-1 and 6.25 μm·s-1 for the isothermal temperature of -85℃ and -75℃

respectively

which means that the surface coating of MNPs can significantly affect the crystallization of Vs55.