磁性材料磁特性的巴克豪森描述  

A Preisach Approach to the Magnetic Properties of Ferromagnet

作　　者：赵素英[1] 李凤舞[2] 

机构地区：[1]河北工业职业技术学院计算机自动化控制系,河北石家庄050091 [2]燕山大学继续教育学院,河北秦皇岛066004

出　　处：《河北师范大学学报（自然科学版）》2004年第3期254-257,共4页Journal of Hebei Normal University：Natural Science

基　　金：河北省自然科学基金资助项目(202139)

摘　　要：实验研究了磁性材料的零场冷却和加场冷却的磁化强度随温度的变化关系,以及不同温度下的磁滞回线;考虑了热涨落和自由能壁垒随温度的变化,改进了Preisach模型并对测量数据进行了拟合;数值模拟再现了测量结果的变化规律;对拟合得到的巴克豪森跳跃谱的有关参数进行了讨论.Zero field cooled (ZFC) and field cooled (FC) magnetization as a function of temperature of itinerant ferromagnet SrRuO_3 has been measured experimentally and also the major hysteresis loop at a sequence of temperatures.The data has been analysed within the framework of a generalized version of the Preisach model of hysteresis which combines thermal fluctuations with the change of the free energy barriers below T_c.The numerical simulations replicate all of the principal structural systematics of the data,and yield details of the spectrum of Barhausen instabilities in this material.

关 键 词：磁性材料 PREISACH模型 不可逆过程 磁滞回线 磁化强度 巴克豪森描述 

分 类 号：O482.5[理学—固体物理]