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We report here on low temperature magnetic relaxation in the erbium orthoferrite ErFeO 3 . The variation of magnetic viscosity, S ≡ ∂M / ∂ / ∂ ln t , with temperature shows three different regimes below 40 K. The most remarkable is that at T ≤ 3 K where S(T) remains constant suggesting the occurrence of macroscopic quantum tunneling of the magnetization.

Electret-forming polymers of vinyl-pyridine and vinyl-quinoline monomers have been synthesized and chemically doped under different conditions, with subsequent structural studies by X-ray diffraction, SEM, EDX-quantitative analysis, DSC, FT-IR, EPR, Mossbauer and other techniques. The results establish some synthesis-structure-doping correlations which are clues to be used in analysing the work in progress on their electric properties.