Susceptibility of non-crystalline ferromagnetic FeF2Report as inadecuate

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Abstract : In the temperature range 150 K > T > 25 K the magnetic susceptibility of non-crystalline FeF2 can be described by a Curie-Weiss law. A paramagnetic Curie temperature of θ = 22 ± 1 K and an effective moment of peff = 5.2 ± 0.1 μB are found. Temperature and field dependence of the magnetization between 15 K-20.5 K indicate superparamagnetic behaviour. At lower temperatures the magnetization shows hysteresis and a slightly time dependent remanence. The observation of moments which approach 4 μ B-Fe2+ implies that the ordered state is ferromagnetic.

Mots-clés : amorphous state Curie temperature ferromagnetic properties of substances iron compounds magnetic hysteresis magnetic moments magnetic susceptibility magnetisation paramagnetic properties of substances remanence superparamagnetism ferromagnetic FeF sub 2 field dependence magnetization superparamagnetic behaviour hysteresis noncrystalline Curie Weiss law temperature dependence

Author: F.J. Litterst



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