N-2-Thiazolylmethacrylamide (NTMA) was polymerized by a radical route to obtain the polymer in good yields. The complexes of PolyNTMA with three rare earth ions Nd(III), Pr(III), and Sm(III) were prepared for the first time. FTIR and H-1 NMR were applied to characterize these materials. The magnetic behavior of PolyNTMA-metal complexes was examined as a function of applied magnetic field at 4 K and as a function of temperature (4-300 K) at an applied magnetic field of 30 kOe. It was found that Pr(III) complex exhibits an antiferromagnetic property, while Nd(III) and Sm(III) complexes exhibit a special magnetic property different from the typical magnet. (c) 2006 Wiley Periodicals, Inc.