Abstract:
In contrast to the experimentally widely used isentropic demagnetization process for cooling to ultra-low temperatures we examine a particular classical model system that does not cool, but rather heats up with isentropic demagnetization. This system consists of several magnetite particles in a colloidal suspension, and shows the uncommon behavior of disordering structurally while ordering magnetically in an increasing magnetic field. For a six-particle system, we report an uncommon structural transition from a ring to a chain as a function of magnetic field and temperature.
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Received 5 September 2000
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Borrmann, P., Stamerjohanns, H., Hilf, E. et al. Paradoxical magnetic cooling in a structural transition model. Eur. Phys. J. B 19, 117–119 (2001). https://doi.org/10.1007/s100510170356
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DOI: https://doi.org/10.1007/s100510170356