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Nano-Goethite (α-FeOOH) Magnetic Structure Investigated Using Ising Core-Shell Model: Preliminary Study

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Abstract:

Ising core-shell model was proposed to reconstruct superparamagnetism hysteresis in nano-goethite (α-FeOOH). Core and shell set as antiferromagnetic and paramagnetic state respectively. Core and shell radius varies until the theoretical hysteresis fit with experiment hysteresis. At low temperature, the hysteresis reconstructed nicely with 55% antiferromagnetic core contribution and 45% paramagnetic shell contribution. At high temperature, the core-shell model show unrealistic result compared to the pure paramagnetic state.

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Periodical:

Materials Science Forum (Volume 1028)

Pages:

193-198

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1028.193

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Online since:

April 2021

Authors:

Budi Adiperdana*, Nadya Larasati Kartika, Risdiana Risdiana

Keywords:

Core-Shell Model, Goethite, Hysteresis, Ising Model, Superparamagnetism

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