The design and preparation of organic soft ferromagtnets by sol-gel processing is reported in this paper. ［γ-(2-Thiazole-ureido)propyl］methyldiethoxysilane (TUPMDES) was firstly sythesized. Polysiloxane (PTUPMDES) and complexes (PTUPMDES-Cu

PTUPMDES-Ni) were prepared via sol-gel process

respectively . They were characterized by IR

1H-NMR

SEM and MS. The structure of the complexes was characterized by FTIR

which suggested that chelation had taken place and was demonstrated by the shift of the characteristic absorption bands. The magnetic properties of these complexes were measured using a physical property measurement system (PPMS 29)

which included magnetization versus temperature

magnetization versus applied field

magnetic susceptibility versus temperature and magnetic hysteresis. The temperature was ranged from 5 K to 300 K

and the intensity of magnetic field was in the range of -4×106 ~ 4×106 A/m. It was found that these complexes were organic soft magnets and had typical “S” shaped magnetic hysteresis loops. The saturation magnetization of PTUPMDESCu

PTUPMDESNi and PTUPMDES-DMS-Ni was 4.39 emu/g

5.75 emu/g

5.27 emu/g

and their remanence magnetization and coercivity were 0002 emu/g

0.003 emu/g

0.002 emu/g and 1510 A/m

1565 A/m

1293 A/m

respectively. While the paramagnetic Curie temperature was 168 K

163 K

263 K. It was discovered that the Curie-Weiss temperature almost increased twice

when the dimethylsiloxane segments were introduced into the polysiloxane chains containing thiazole groups.