Effect of Thermal Fluctuations on the Anhysteretic Process in Ferromagnetic Fine-Particle Assemblies

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Abstract
The temperature dependence of the ``ac melting curve'', introduced in a recent paper, has been estimated theoretically, taking as an example a carbonyl ironpowder for which measurements at 77°K and 300°K are presented. The theory is based on considerations of thermal fluctuation phenomena, and the estimated shift of the curves as the temperature is changed is in reasonable agreement with observation. The various approximations involved in the calculation are stated and the implications of the results discussed.