标题： 涂覆导体的电磁分析：新见解 显示英文标题

标题： Electromagnetic analysis of coated conductors with ferromagnetic substrates: Novel insights

摘要： 铁磁基板可以显著影响涂覆导体对外部磁场和传输电流的电磁响应。 本研究利用薄膜积分微分模型对此响应进行了理论分析。 首先，假设基板具有强磁性且超导体处于迈斯纳状态，我们以方便的显式形式给出了解析解。 这有助于我们分析超导电流密度分布，并突出其与非磁性基板导体之间的差异。 其次，对于具有非线性电流-电压关系的超导层以及具有有限场独立磁导率的基板，我们采用有效的谱数值方法研究了这种混合超导体/铁磁体系统的独特特性，例如平行外场中的磁化以及当同时施加交替传输电流和平行场时观察到的损失的奇特非单调变化。 还研究了直接传输电流和交替平行场情况下的动态损耗。 结果表明，调节施加的平行场的相位和振幅与传输电流的相位和振幅相对应，可以最小化交流损耗。 显示英文摘要

摘要： Ferromagnetic substrates can significantly influence the electromagnetic response of a coated conductor to an external magnetic field and transport current. This study analyzes this response theoretically using the thin shell integrodifferential model. First, assuming the substrate is strongly magnetic and the superconductor is in the Meissner state, we present the analytical solution in a convenient explicit form. This helps us to analyze the superconducting current density distributions, highlighting their differences from those in conductors with non-magnetic substrates. Secondly, for a superconducting layer characterized by a nonlinear current-voltage relation and a substrate with a finite field-independent magnetic permeability, we use an effective spectral numerical method to study the unique features of this hybrid superconductor/ferromagnet system, such as magnetization in a parallel external field and the peculiar nonmonotonic variation of loss observed when alternating transport current and parallel field are applied simultaneously. Dynamic losses for the case of a direct transport current and an alternating parallel field are also investigated. It is shown that tuning the phase and amplitude of the applied parallel field relative to those of the transport current can minimize AC losses.