The direct and indirect correlation between organic radicals in a quasi-one-dimensional organic ferromagnet model is investigated. By introducing random-phase-approximation (RPA), the typical spin-wave excitation modes of the model are obtained. The stiffness of acoustic spin-wave mode is found to represent the correlation between radicals. The variation of the stiffness according to the parameters of the system is discussed and indicates the unique features of the organic ferromagnet. Copyright (C) 1996 Elsevier Science Ltd
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