振荡磁场作用下涂覆超导体的磁滞交流损耗：铁磁效应和频率依赖性
Hysteretic ac loss in a coated superconductor subjected to oscillating magnetic field: ferromagnetic effect and frequency dependence
摘要：
在振荡磁场存在下，通过有限元技术对具有更真实结构的涂层超导体的磁滞交流损耗进行了数值模拟。采用准静态矢量势近似方法，结合超导层和铁磁衬底的非线性描述，分别用幂律模型和Langevin方程对涂层超导体进行电磁建模。根据所施加的磁场的强度，铁磁基板上的磁滞交流损耗的不同效果，显示和其根本原因被确定。滞后交流损耗对所施加的频率的依赖关系被发现是与所施加的磁场的临界振幅，和涡流损耗消散在金属涂层变得突出，因为频率增加，只是在高施加磁场。
英文摘要：
Numerical simulations of the hysteretic ac loss in a coated superconductor with a more realistic version of architecture were performed via finite-element technique in the presence of an oscillating magnetic field. The coated superconductor was electromagnetically modeled by resorting to the quasistatic approximation of a vector potential approach in conjunction with the nonlinear descriptions of the superconducting layer and ferromagnetic substrate therein by a power law model and the Langevin equation respectively. A diverse effect of the ferromagnetic substrate on the hysteretic ac loss, depending on the strength of the applied magnetic field, was displayed and its underlying cause was identified. The dependence of the hysteretic ac loss on the applied frequency is found to be related to a critical amplitude of the applied magnetic field, and the eddy-current loss dissipated in the metal coatings becomes prominent as the frequency augments merely at high applied magnetic fields.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
