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Random field effects in a disordered metamagnet: magnetic domains and their dynamics

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Bertrand, D. | Ferré, J. | Meyer, P. | Pommier, J. | Kleeman, W.

Edité par CCSD ; Elsevier -

International audience. The low temperature (H, T) magnetic phase diagram of the dilute Ising antiferromagnet Fe0.8Mg0.2Cl2 has been determined. A strong time-dependent magnetic hysteresis on mixed phase boundaries is evidenced and is analyzed from the magneto-optical imaging of the evolution of the magnetic domain pattern. This behaviour is attributed to random fields creating a metastable mesoscopic multidomain antiferromagnetic state.

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