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.
出处
《河北师范大学学报（自然科学版）》
CAS
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)
