Direct Jc measurements and trapped field profiles using an identical superconducting bulk
Direct Jc measurements and trapped field profiles using an identical superconducting bulk
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DOI：
10.1088/0953-2048/24/10/105003
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发表时间：
2011-10
影响因子：
3.6
通讯作者：
H. Fujishiro;T. Naito;Daiki Furuta;T. Arayashiki;Y. Yanagi;Y. Itoh
中科院分区：
文献类型：
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作者：
H. Fujishiro;T. Naito;Daiki Furuta;T. Arayashiki;Y. Yanagi;Y. Itoh
在厚度为2mm的GdBCO超导块材上，分别采用脉冲场磁化（PFM）、零场冷却磁化（ZFC）和场冷却磁化（FCM）方法，测量了块材的俘获场分布。的配置文件进行了比较与分布的绝对值的临界电流密度（Jc）估计的磁化强度测量，使用小块从散装板。与生长扇区区域（GSR）相比，晶种以下的Jc值提高了约20%。增长部门边界（GSB）的Jc值也略有提高。对于一个较低的应用脉冲场比PFM的全磁化，少量的磁通量被优先捕获在较低的Jc区域周围的散装周边，这不一定是类似的ZFC。对于较高的施加脉冲场，磁通量最终被捕获在籽晶下方和GSB处。
We measured the trapped field profiles on a ∅45 mm GdBCO superconducting bulk plate of 2 mm thickness magnetised using pulsed field magnetisation (PFM), zero-field-cooled magnetisation (ZFC) and field-cooled magnetisation (FCM). The profiles were compared with the distribution of the absolute value of the critical current density (Jc) estimated by the magnetisation measurements using small pieces cut from the bulk plate. The Jc value was enhanced about 20% below the seed crystal compared with that in the growth sector regions (GSRs). The Jc value was also slightly enhanced on the growth sector boundaries (GSBs). For a lower applied pulsed field than that for full magnetisation for PFM, a small amount of the magnetic flux was preferentially trapped at the lower Jc region around the bulk periphery, which was not necessarily similar to that by ZFC. For a higher applied pulsed field, the magnetic flux was finally trapped below the seed crystal and at the GSBs.