Thermal hysteresis of Morin transition in hematite particles

文献情報

出版日 2010-05-18

DOI 10.1039/B925371H

インパクトファクター 3.676

著者

L. Suber, P. Imperatori, A. Mari, G. Marchegiani, M. Vasquez Mansilla, D. Fiorani, W. R. Plunkett, D. Rinaldi, C. Cannas, G. Ennas

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要旨

Rhombohedral shaped, single crystal hematite particles with narrow size distribution (〈DTEM〉 = 93 ± 2 nm) were prepared by hydrolysis of iron chloride and polymerisation in water. The results of field dependent magnetization measurements at different warming–cooling rates and ac susceptibility measurements at varying frequencies are reported and discussed. Thermal hysteresis (ΔTM) associated with the Morin transition and field dependence of the Morin temperature (TM) are observed in warming–cooling cycles (ΔTM = 25 and 13 K for H = 0.1 and 3 T, respectively) due to the first order phase transition. A frequency dependence of ac susceptibility is observed above TM, as a result of the relaxation of the magnetic moment of hematite particles in the weak-ferromagnetic phase.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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