Crossed-magnetic-field experiments on stacked second generation superconducting tapes: Reduction of the demagnetization effects
Crossed-magnetic-field experiments on stacked second generation superconducting tapes: Reduction of the demagnetization effects
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DOI：
10.1063/1.4879263
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发表时间：
2014-06-09
影响因子：
4
通讯作者：
Coombs, T. A.
中科院分区：
文献类型：
--
作者：
Baghdadi, M.;Ruiz, H. S.;Coombs, T. A.
介绍了交叉磁场对堆叠第二代（2G）高温超导带材去磁因子的影响。超导样品最初被磁化沿着c轴的磁场冷却磁化方法和实现后的样品的磁弛豫，一个广泛的一组实验测量的不同幅度的施加的交流磁场平行于ab平面进行。一方面，一个显着减少的退磁因子与超导块材的报道值相比，报告。另一方面，退磁因子随交流横向磁场的幅度线性增加，证实了Brandt [Phys. Rev. B 54，4246（1996）]预测的磁化率的普遍线性行为。该研究还进行了在不同频率的交流横向磁场，以确定该参数对退磁因子测量的影响。我们报告一个甚至更低的退磁因子，只要横向磁场的频率增加。因此，我们发现通过使用堆叠的2G-超导带（与超导体之一相比具有更高的机械强度）的去磁因子的显著降低使得这种配置成为未来开发更高效的高功率密度旋转机器和强磁体应用的非常有吸引力的候选者。(C)2014 AIP出版有限责任公司。
The crossed-magnetic-field effect on the demagnetization factor of stacked second generation (2G) high temperature superconducting tapes is presented. The superconducting sample was initially magnetized along the c-axis by the field cooling magnetization method and after achieving the magnetic relaxation of the sample, an extensive set of experimental measurements for different amplitudes of an applied ac magnetic field parallel to the ab-plane was performed. On the one hand, a striking reduction of the demagnetization factor compared with the reported values for superconducting bulks is reported. On the other hand, the demagnetization factor increases linearly with the amplitude of the ac transverse magnetic field confirming the universal linear behavior for the magnetic susceptibility predicted by Brandt [Phys. Rev. B 54, 4246 (1996)]. The study has been also pursued at different frequencies of the ac transverse magnetic field in order to determine the influence of this parameter on the demagnetization factor measurements. We report an even lower demagnetization factor as long as the frequency of the transverse magnetic field increases. Thus, the significant reduction on the demagnetization factor that we have found by using stacked 2G-superconducting tapes, with higher mechanical strength compared with the one of superconducting bulks, makes to this configuration a highly attractive candidate for the future development of more efficient high-power density rotating machines and strong magnet applications. (C) 2014 AIP Publishing LLC.