Effect of boundary conditions on SDW and CDW in organic ferromagnetic chains

Effect of sizes and dimensions on the spin density wave (SDW) and charge de nsity wave (CDW) in organic ferromagnets was studied. It was found that the stable ferromagnetic state obtained in a closed ring with periodic boundar y conditions would become unstable in an open chain due to the effect of ch ain ends. There was a competition between the spin-spin (s-s) couplings and the electron-electron (e-e) interactions for the formation of SDW and CDW in the main chain. Interchain couplings would strengthen SDW. It was sugges ted that the one-dimensional model should be improved to understand the org anic magnetism well.