Pulsed-field Invasion to HTS Bulk Magnets Grown from Two Seeds with Varied Seed-crystal Positions and Numbers
Pulsed-field Invasion to HTS Bulk Magnets Grown from Two Seeds with Varied Seed-crystal Positions and Numbers
复制标题
脉冲场侵入由两种具有不同籽晶位置和数量的种子生长的高温超导块体磁体
DOI：
10.1016/j.phpro.2014.09.021
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Langer
中科院分区：
文献类型：
--
作者：
T. Oka;Y. Yamada;T. Horiuchi;J. Ogawa;S. Fukui;Takashi Sato;K. Yokoyama;M. Langer
在30.6K下，对Y-Ba-Cu-O块体磁体在脉冲磁场磁化过程中和磁化后的磁通侵入行为进行了精确的测量和分析。采用两种晶种或晶种位置偏离样品表面中心的方法制备了具有单畴分布的块状材料。虽然激活后的捕获磁通密度的性能没有表现出明显的差异，磁通开始侵入到样品中的两个种子明显低于正常生长的各向同性晶体的低场。由于磁通穿透行为，因此，明显不同的样品与结构生长从两个种子和均匀生长的样品与籽晶，它建议，该结构的结果在一个有效的磁化方法与较少的加热比传统的样品，这导致在更高的性能的场捕获在大块磁铁比平常。
The flux-invasion behavior into the melt-processed Y-Ba-Cu-O bulk magnets were precisely measured and analyzed during and after their pulsed-field magnetization processes operated at 30.6 K. The materials were fabricated as the bulk monoliths grown by adopting two seed-crystals, or shifting the seed-crystal positions from the centre of the sample surface, which exhibited the magnetically single-domain distributions. Although the performances of the trapped flux density after activations showed no obvious differences, the flux started invading into the sample bearing two seeds obviously at lower fields than those of normally-grown isotropic crystal. Since the flux penetration behavior were thus clearly different between the samples with the structure grown from two seeds and uniformly grown samples with a seed crystal, it is suggested that the structure results in an effective magnetizing method with less heating than those of conventional samples, which results in the higher performance of field trapping in the bulk magnets than usual.