排序方式: 共有48条查询结果,搜索用时 109 毫秒
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Magnetic hysteresis properties of antiferromagnetically exchange-coupled bilayer structures, in which the two magnetic layers have different magnetic parameters and thicknesses, are studied within the framework of the Stoner-Wohlfarth model. Analytical expressions for the switching fields corresponding to the linear magnetic states are obtained. By adjusting the magnetic parameters or thicknesses of layers, nine different types of easy-axis hysteresis loops may exist. The phase diagram of easy-axis hysteresis loops is mapped in the k1 and k2 plane, where k1 and k2 are the ratios of magnetic anisotropy to the interlayer exchange coupling of the two magnetic layers, respectively. 相似文献
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推荐一个大学化学综合实验: Fe/Fe3O4磁性材料的合成、结构性质与磁性能的测定,该实验涉及材料的合成、结构表征和磁性能的测定。通过该实验可以使学生掌握一些大型仪器的基本原理和基本操作,掌握材料合成的方法、材料结构及形貌的表征手段以及磁滞曲线的测定方法。使学生在掌握材料研究的基础理论和基本实验技能的同时,培养学生独力实验能力和创新意识,尤其是培养他们综合运用知识的能力。进一步缩短教学与科研的距离。 相似文献
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本利用临界态模型Jc=βB^-p叙述了长柱矩形或圆形截面Bi2223/Ag19芯高温超导带材在温度4.5K和与柱轴平行外场下的磁化行为,临界电流密度和磁滞损耗,并与实验结果进行比较。 相似文献
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测量金属导线磁滞损耗的简易装置曹建,徐慧(中南工业大学应用物理系,长沙410083)金属材料在交流磁场中会产生涡流损耗,磁性材料还会产生磁滞损耗.组建一套实验装置来测量这些损耗,会加深学生对有关的理论知识的理解.我们结合科研工作的需要,设计并安装了一... 相似文献
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介绍了关于Bi(2223)/Ag带超导电流的特性,包括本征钉扎,Ic与Lorentz力大小的关系,Ic的磁滞。也就是说,Ic的大小不仅与磁场的历史有关,而且与样品在磁场中取向的历史也有关。提出了Ic磁滞的物理解释。评述了Bi(2223)/Ag带中导电的各种模型,包括砖墙模型、铁路道岔模型和自由流通模型。最后指出提高超导电流密度的可能途径。 相似文献
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This paper presents theoretical and experimental studies on the magnetodynamics and energy absorption in a dilute suspension of small ferromagnetic particles with magnetic hysteresis and mechanical mobility in an AC magnetic field. Experiments with 0.1% suspensions of acicular particles of gamma ferric oxide in solid and liquid matrices, subjected to a 430 Hz magnetic field with an intensity of up to 1200 Oe, revealed important role of particle mobility. The main qualitative and quantitative features of the phenomenon are in agreement with a model of joint magneto-mechanical dynamics of particles with a chain-of-spheres mode of incoherent magnetic reversal. 相似文献