Abstract
Ferromagnetic behaviour at 300 K has been observed from SQUID experiments in ClO 4 - doped PMTh. The samples were prepared electrochemically at 25 °C in acetonitrile with 0.1M LiClO 4 and then partially reduced. Atomic absorption analysis discards magnetic particles contamination. Hysteresis curves were observed for pressed pellets in all range of temperatures (300K-2K). The remanence at 300 K and pressed at 250 bar was around 8.06x10 -4 emu/g with coercitivity of 130 Oe. The influence of water content in the solvent during the sample synthesis and the pressure is shown. We discuss a model that explains our data in terms of the anisotropic superexchange Dzialoshinski-Moriya interaction giving rise to weak ferromagnetism.,.
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