Thermodynamics of finite magnetic two-level systems

(2) Department of Physics; Astronomy; Center for Fundamental Materials Research; David Tomanek (2) ((1) Department of Physics of the University of Oldenburg; East Lansing); Eberhard Hilf (1); Germany; Heinrich Stamerjohanns (1); Michigan State University; Peter Borrmann (1)

arxiv: cond-mat/9601138 · v1 · submitted 1996-01-29 · ❄️ cond-mat

Thermodynamics of finite magnetic two-level systems

Peter Borrmann (1) , Heinrich Stamerjohanns (1) , Eberhard Hilf (1) , Philippe Jund (2) , Seon Gon Kim (2) , David Tomanek (2) ((1) Department of Physics of the University of Oldenburg , Germany , (2) Department of Physics

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Astronomy Center for Fundamental Materials Research Michigan State University East Lansing)

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classification ❄️ cond-mat

keywords chainmagneticphaseringsystemtwo-levelaggregatesanalyze

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We use Monte Carlo simulations to investigate the thermodynamical behaviour of aggregates consisting of few superparamagnetic particles in a colloidal suspension. The potential energy surface of this classical two-level 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 intriguing system and analyze thermodynamically the nature of the transition between the ring and the chain `phase'.

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Thermodynamics of finite magnetic two-level systems

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