多晶Sr_(0.6)Ca_(0.4)RuO_3磁性的Preisach模型研究  

Magnetic Properties of Polycrystalline Sr_(0.6)Ca_(0.4)RuO_3

作　　者：徐静[1] 王海涛[1] 侯登录[2] 

机构地区：[1]河北工程大学理学院,河北邯郸056038 [2]河北师范大学物理学院,河北石家庄050016

出　　处：《稀有金属》2007年第6期762-765,共4页Chinese Journal of Rare Metals

摘　　要：测量了多晶Sr0.6Ca0.4RuO3的零场冷却(ZFC)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。考虑热涨落和自由能壁垒随温度的变化,用Preisach模型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,其中包括各温度下的磁滞回线,不同外磁场下的ZFC磁化强度曲线等。对拟合得到的巴克豪森跳跃谱的有关参数进行了讨论。A sample of Sr0.6Ca0.4RuO3 was characterized by zero field cooling（ZFC） and the major hysteresis loops under different temperatures were determined.The data were analyzed within the framework of a generalized Preisach model, accounting for thermal fluctuations,critical phenomenon,and the temperature dependent distribution of free energy barriers.The model provided an excellent description of the experimental data,and the simulated results were in good agreement with experiment results.All the ZFC curves at different applied fields and all the hysteresis loops at different temperatures could be replicated by the model with one set of parameters,and the parameters were discussed,the discussion results showed some guidance in theory about magnetic properties of polycrystalline.

关 键 词：BARKHAUSEN跳跃 PREISACH模型 ZFC磁化强度 

分 类 号：O482[理学—固体物理]