Abstract:
Within mean field approximation we investigate the phase diagrams of magnetic fluids in presence of a magnetic field. In a finite field the magnetic phase transition is absent, but instead a line of first order liquid-liquid transitions ending in a critical point occurs for a magnetic interaction, which is sufficiently strong. Varying the magnetic field these critical points extend from the tricritical point at H=0 to a critical endpoint. For a fluid with Ising spins we calculate the critical lines and several tricritical exponents analytically. For Heisenberg fluids we obtain the phase diagrams from a numerical solution of the mean field equations of state.
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Received 20 March 1998
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Schinagl, F., Iro, H. & Folk, R. Magnetic fluids in an external field. Eur. Phys. J. B 8, 113–123 (1999). https://doi.org/10.1007/s100510050673
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DOI: https://doi.org/10.1007/s100510050673