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首页> 外文期刊>Superconductor Science & Technology >Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling
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Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling

机译：磁矩和局部磁诱导超导/铁磁结构进行交叉领域：GDBCO的实验和建模

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摘要

Recent studies have shown that ferromagnetic materials can be used together with bulk high temperature superconductors in order to improve their magnetic trapped field. Remarkably, it has also been pointed out that ferromagnets can help in reducing the crossed field effect, namely the magnetization decay that is observed under the application of AC transverse magnetic fields. In this work, we pursue a detailed study of the influence of the geometry of the ferromagnetic part on both trapped fields and crossed field effects. The magnetic properties of the hybrid superconducting/soft ferromagnetic structures are characterized by measuring the magnetic moment with a bespoke magnetometer and the local magnetic field density with Hall probes. The results are interpreted by means of 2D and 3D numerical models yielding the distribution of the superconducting currents as a function of the ferromagnet geometry. We examine in details the distortion of the shielding superconducting currents distribution in hybrid structures subjected to crossed magnetic fields. These results confirm the existence of an optimum thickness of the ferromagnet, which depends on the saturation magnetization of the ferromagnetic material and the current density of the superconductor. A hybrid structure providing an efficient protection against the crossed magnetic field while maintaining the magnetic induction along the axis of the structure is suggested. The limitations of the 2D modelling in this configuration are discussed.
机译：最近的研究表明，铁磁材料可以与散装高温超导体一起使用，以改善其磁捕获场。值得注意的是，已经指出的是，铁磁体可以有助于降低交叉的场效应，即在应用AC横向磁场的应用下观察到的磁化衰减。在这项工作中，我们探讨了铁磁部分几何形状对捕获场和交叉场效应的影响。混合超导/软铁磁结构的磁性特征在于用定制磁力计测量磁矩和霍尔探针的局部磁场密度。结果通过2D和3D数值进行解释，其作为铁磁性几何形状的函数产生超导电流的分布。我们在细节中检查屏蔽超导电流分布在经受交叉磁场的混合结构中的扭曲。这些结果证实了铁磁性最佳厚度的存在，这取决于铁磁材料的饱和磁化和超导体的电流密度。建议提出了一种混合结构，其提出了沿着结构轴线保持磁感冒的交叉磁场的有效保护。讨论了在该配置中的2D建模的局限性。

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