Abstract
Stacks of superconducting tape can be magnetized to form a new type of permanent magnet due to their ability to circulate persistent currents. Previous work has mostly focussed on magnetization of smaller stacks made of 12-mm tape, but this study reports the trapped field from both field cooling and pulsed field magnetization at 77 K for larger 40-mm wide, high-temperature superconducting tape produced by Bruker HTS. The tape used in this study had a critical current of approximately 570 A at 77 K (self-field). The trapped field profile is reported for a stack of eight octagonal tape pieces showing very high symmetry, and detailed Hall probe scans of the individual tape layers at 77 K reveal the uniformity of the pieces and presence of any defects which divert current flow. The effect of cutting the layers and also applying compressive strain on the tape pieces was investigated. It was found that cutting the 40-mm large squares into octagons had negligible effect on trapped field whilst compressing the layers, which are naturally curved, can lead to reversible degradation of trapped field for large enough compression. Magnetized stacks of tape of a large size and relatively uniform current density represent an attractive technology for trapped field permanent magnets with high magnetic field and flux.
Similar content being viewed by others
References
Zhou, D., Izumi, M., Miki, M., Felder, B., Ida, T., Kitano, M.: An overview of rotating machine systems with high-temperature bulk superconductors. Supercond. Sci. Technol. 25(10), 103001 (2012)
Patel, A., Hopkins, S., Giunchi, G., Figini Albisetti, A., Shi, Y., Palka, R., Cardwell, D., Glowacki, B.: The use of an MgB 2 hollow cylinder and pulse magnetized (RE)BCO bulk for magnetic levitation applications. Appl. Supercond, IEEE Transa. PP(99), 1–1 (2012). doi:10.1109/tasc.2012.2236143
Patel, A., Pałka, R., Glowacki, B.A., Giunchi, G., Figini Albisetti, A., Shi, Y., Cardwell, D.A., Hopkins, S.C.: Permanent magnet enhancement of fully superconducting MgB MgB2-YBa2Cu3O7-x Bearing. J. Supercond. Nov. Magn. 1–7 (2012). doi:10.1007/s10948-012-1915-4
Patel, A., Filar, K., Nizhankovskii, V.I., Hopkins, S.C., Glowacki, B.A.: Trapped fields greater than 7 T in a 12 mm square stack of commercial high-temperature superconducting tape, Vol. 102, pp 102601–102605 (2013)
Patel, A., Hopkins, S.C., Glowacki, B.A.: Trapped fields up to 2 T in a 12 mm square stack of commercial superconducting tape using pulsed field magnetization. Supercond. Sci. Technol. 26(3), 032001 (2013)
Hahn, S., Voccio, J., Bermond, S., Park, D.K., Bascunan, J., Kim, S.B., Masaru, T., Iwasa, Y.: Field performance of an optimized stack of YBCO square snnuli for a compact NMR magnet. IEEE Trans. Appl. Supercond. 21(3), 1632–1635 (2011). doi:10.1109/Tasc.2010.2103920
Michinaka, S., Kouji, S., Naoki, H., Shigeo, N.: The reversible strain effect on critical current over a wide range of temperatures and magnetic fields for YBCO coated conductors. Supercond. Sci. Technol. 23(8), 085013 (2010)
Patel, A., Giunchi, G., Albisetti, A.F., Shi, Y., Hopkins, S.C., Palka, R., Cardwell, D.A., Glowacki, B.A.: High force magnetic levitation using magnetized superconducting bulks as a field source for bearing applications. Phys. Procedia 36(0), 937–942 (2012). doi:10.1016/j.phpro.2012.06.233
Selva, K., Majkic, G.: Trapped magnetic field profiles of arrays of (Gd, Y)Ba2Cu3Ox superconductor tape in different stacking configurations. Supercond. Sci. Tech. 26(11) (2013). doi:10.1088/0953-2048/26/11/115006
Acknowledgment
Authors would like to acknowledge the financial support of the Engineering and Physical Sciences Research Council, UK, for the work reported.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Patel, A., Usoskin, A., Baskys, A. et al. Trapped Field Profiles for 40-mm Wide Superconducting Tape Pieces. J Supercond Nov Magn 28, 397–401 (2015). https://doi.org/10.1007/s10948-014-2665-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-014-2665-2