摘要
用溶胶-凝胶法制备了多晶La0.7Sr0.3MnO3块状样品。利用超导量子磁强计测量了样品在不同状态下的场冷却、零场冷却、等温剩磁、热剩磁曲线以及磁滞回线,分析得到了样品的技术磁化参数。用相同的一套参数,利用基于双势阱的Preisach模型再现了样品所有的磁测量曲线,得到了耗散场的大小和分布。
The lumpish polyerystalline La0.7Sr0.3MnO3 samples were fabricated by sol-gel method. The temperature dependence of the field cooled moment, the zero field cooled moment, the thermoremanent moment, and the isothermal remanent moment were collected in a fixed external field by SQUID. The numerical simulations clearly replicate all of the experimental data using the same parameters based on the Preisach model. The distribution of the dissipation field is obtained.
出处
《真空与低温》
2007年第1期25-27,37,共4页
Vacuum and Cryogenics
基金
国家自然科学基金(50371034)
兰州交通大学光电技术与智能控制教育部重点实验室开放课题(K04113)资助
