Studies of the self-ordering process in FePt self-ordered magnetic array media

Verdes, C.; Ahner, J.; Jones, P. M.; Shukla, N.; Chantrell, R. W.; Weller, D.
June 2005
Applied Physics Letters;6/27/2005, Vol. 86 Issue 26, p263106
Academic Journal
A model of self-organization in FePt particulate thin films is described. The model is based on Monte Carlo methods and describes the self-organization process from the colloidal state as a result of the evaporation of the solvent and the consequent compression of the film due to surface tension forces. The model predicts the self-ordered state for systems with very narrow particle size distributions (standard deviation of the lognormal distribution σ<0.05). Various forms of interparticle potentials were considered. A comparison of the model with experimental data shows that the interparticle potential must contain an attractive term, in addition to the repulsive term normally expected to arise from the surfactant. Quantum chemistry calculations show that an attractive potential does indeed exist between overlapping oleic acid molecules. Although the ordering predicted by the model is predominantly hexagonal, the conditions for the formation of a square lattice are investigated, and an explanation for the observation of square lattices in some systems is proposed.


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