Magnetic Nanoparticles as Pinning Center in Bi-Sr-Ca-Cu-O/Ag Superconductor Tapes


Article Preview

This paper reports on the effectiveness of magnetic nanoparticles as pinning center in the Bi-based superconductor tapes. Nanosize γ-Fe2O3 and ultrafine Fe3O4 have been employed to enhance the transport current density of Ag-sheathed-(Bi1.6Pb0.4)Sr2Ca2Cu3O10 superconductor tapes prepared by the powder-in-tube technique. The transport critical current density, Jc of (Bi1.6Pb0.4)Sr2Ca2Cu3O10-(γ-Fe2O3)0.01, sintered at the optimum temperature of 845 oC is 6490 A/cm2 when measured at 77 K. A further single intermediate rolling step increases Jc to 9560 A/cm2. Samples without γ-Fe2O3 prepared under the same condition showed a lower Jc with a maximum of 1560 A/cm2. Similar results are also obtained for ultrafine Fe3O4. Magnetic impurities generally suppress superconductivity. However, our study shows great promise of magnetic nanorod γ-Fe2O3 and ultrafine Fe3O4 as novel pinning centers in enhancing the transport critical density of Ag sheathed Bi-Sr-Ca-Cu-O superconductor tapes. This is in line with previous calculations on frozen flux superconductor with magnetic nanoparticle as pinning centers.



Edited by:

A.K. Arof and S.A. Hashim Ali




R. Abd-Shukor and S.Y. Yahya, "Magnetic Nanoparticles as Pinning Center in Bi-Sr-Ca-Cu-O/Ag Superconductor Tapes", Materials Science Forum, Vol. 517, pp. 212-216, 2006

Online since:

June 2006




[1] K. Christova, A. Manov, J. Nyhus, U. Thisted, O. Herstad, S.E. Foss, K.N. Haugen, K. Fossheim, J. of Alloys and Compounds, 340 (2002), p.1.


[2] Z. H. He, T. Habisreuther, G. Bruchlos, D. Litzkendorf and W. Gawalek, Physica C, 356 (2001), p.277.


[3] I.F. Lyuksyutov, D.G. Naugle, Frozen Flux Superconductors, Mod. Phys. Lett. B., 13 (1999), p.491.

[4] S.Y. Yahya, M.H. Jumali M.H., C.H. Lee, R. Abd-Shukor, J. Materials Science, 39 (2004) , p.7125.

[5] Mahizah Ismail, R. Abd-Shukor, Imad Hamadneh, S.A. Halim, J. of Materials Science 39 (2004), p.3517.

[6] Kilic A, Kilic K and Senoussi S J. Appl. Phys. 84, (1998), p.3254.