Trapped magnetic fields in melt-textured YBCO

✍ Scribed by F. Frangi; L. Jansak; M. Majoros; S. Zannella

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 840 KB
• Volume: 224
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90600-9

✦ Synopsis

The surface of melt-textured bulk YBCO samples, cooled at liquid-nitrogen temperature, was mapped with an automatic Hall probe-based system to study the spatial distribution of trapped magnetic fields. Such a magnetic characterization offers detailed information about the granular structure of differently prepared samples. Both axial and tangential trapped magnetic-field components were measured, the axial component of the trapped magnetic field allows one to obtain the number of grains, their shapes, their dimensions and their locations, while measurements of the tangential component of the trapped magnetic field give complementary information on the grain positions. Intragranular critical current densities were estimated by comparing experimental trapped magnetic-field profiles with theoretical ones calculated using the critical-state model.