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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Reversible-irreversible magnetization processes and remanence properties of coprecipitated cobalt ferrite
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Reversible-irreversible magnetization processes and remanence properties of coprecipitated cobalt ferrite

机译：共沉淀钴铁氧体的可逆-不可逆磁化过程和剩磁性能

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摘要

Cobalt ferrite was obtained by coprecipitation of iron (II) sulphate and cobalt (II) sulphate in acetone medium. Using the moving Preisach model, the reversible (M_(rev)) and irreversible (M_(irr)) components of the magnetization were separated. The parameter #eta# given by #eta# =(dM_(rev)/dM_(irr))_(H_i) and the moving Preisach parameter k_m, were evaluated according to the relation #eta# =k_m X_(rev) in order to investigate the behavior of M_(rev). It was found that #eta# is not proportional to the reversible susceptibility, therefore k_m is a function of the internal field. Isothermal remanent magnetization (IRM) and DC demagnetization (DCD) curves were measured. From these data the #delta# m curve and the Henkel plot were obtained showing that all the points remain under the Wohlfath line indicating that the local disorder dominates (demagnetizing-like effect) over the mean-field effect. The switching field distribution curves were obtained by differentiation of the IRM and DCD curves. The peak values of these switching field distributions differ by a factor of 2.7.
机译：通过在丙酮介质中共沉淀硫酸铁（II）和硫酸钴（II）获得铁氧体钴。使用移动的Preisach模型，磁化的可逆（M_（rev））和不可逆（M_（irr））分量被分离。根据关系＃eta＃= k_m X_（rev）依次评估由＃eta＃=（dM_（rev）/ dM_（irr））_（H_i）给出的参数＃eta＃和运动的Preisach参数k_m。调查M_（rev）的行为。发现＃eta＃与可逆磁化率不成比例，因此k_m是内部场的函数。测量了等温剩磁（IRM）和直流退磁（DCD）曲线。从这些数据获得的Δδ曲线和汉克尔图表明，所有点都保留在Wohlfath线下，这表明局部紊乱在平均场效应上起着主导作用（消磁作用）。开关场分布曲线是通过对IRM和DCD曲线进行微分而获得的。这些开关场分布的峰值相差2.7倍。

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