La0.7Sr0.3MnO3磁性的Preisach模拟
MODELING THE IRREVERSIBLE RESPONSE OF La0.7Sr0.3MnO3 BASED ONPREISACH MODEL
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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。Abstract: The lumpish polycrystalline 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.
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