Thermodynamics of finite magnetic two-isomer systems

von Peter Borrmann, Heinrich Stamerjohanns, Eberhard R. Hilf, Phillippe Jund, David Tomanek
Journal: Journal of Chemical Physics
Volume: 111, 23
We use Monte Carlo simulations to investigate the thermodynamical behavior of aggregates consisting of few superparamagnetic particles in a colloidal suspension. The potential energy surface of this classical two-isomer system with a stable and a metastable ``ring'' and ``chain'' configuration is tunable by an external magnetic field and temperature. We determine the complex ``phase diagram'' of this system and analyze thermodynamically the nature of the transition between the ring and the chain ``phase.''