CUED Publications database

Addition of ferromagnetic CoFe2O4 to YBCO thin films for enhanced flux pinning

Wimbush, SC and Yu, R and Bali, R and Durrell, JH and MacManus-Driscoll, JL (2010) Addition of ferromagnetic CoFe2O4 to YBCO thin films for enhanced flux pinning. Physica C: Superconductivity and its Applications, 470. ISSN 0921-4534

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An attempt has been made to prepare a YBa 2 Cu 3 O 7-δ (YBCO) thin film doped with ferromagnetic CoFe 2 O 4 . Transmission electron microscopy of the resultant samples shows, however, that Y(Fe, Co)O 3 forms as a nanoparticulate dispersion throughout the film in preference to CoFe 2 O 4 , leaving the YBCO yttrium deficient. As a consequence, the superconducting properties of the sample are poor, with a self-field critical current density of just 0.25 MA cm -2 . Magnetic measurements indicate however that the Y(Fe, Co)O 3 content, together with any other residual phases, is also ferromagnetic, and some interesting features are present in the in-field critical current behaviour, including a reduced dependence on applied field and a strong c-axis peak in the angular dependence. The work points the way towards future attempts utilising YFeO 3 as an effective ferromagnetic pinning additive for YBCO. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:24
Last Modified: 14 Jun 2018 01:59