单畴YBCO超导块材的脉冲充磁磁化规律

Study on the pulsed-field magnetization of single domain YBCO bulk

为了提高氧化钇钡铜(YBCO)超导体的捕获磁场,成功制备了单畴YBCO超导块材,研究了不同强度脉冲磁场和充磁次数对YBCO超导体捕获磁场的影响。结果表明:对直径20mm的YBCO超导体,存在一个最佳的脉冲磁场强度,使得捕获磁场最强;当采用最佳脉冲磁场充磁时,增加充磁次数可以显著增加YBCO超导体的捕获磁场。进一步采用Bean模型解释了该磁化规律。本文的研究结果有助于提高YBCO超导体的磁化效果和理解YBCO超导体的磁化机制。

In order to improve the trapped field of YBCO bulk,a single domain YBCO bulk was successfully fabricated,and the effects of the intensity and the magnetization time of pulsed mag-netic fields on the trapped field have been investigated in detail.The result shows that the intensi-ty of the trapped field in YBCO superconductor with the diameter of 20 mm may reach its maxi-mum when the magnetic field with an optimal intensity(4.8 T)is applied.The trapped field in-creases significantly when the sample is magnetized for several times by the optimal magnetic field.Furthermore,the magnetization process is explained by Bean model.The results in this work helps to improve the magnetization efficiency of YBCO superconductors and understand the mag-netization mechanism.