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. S223-S224. ISSN 0921-4534

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Abstract

An attempt has been made to prepare a YBa2Cu3O 7-δ (YBCO) thin film doped with ferromagnetic CoFe 2O4. Transmission electron microscopy of the resultant samples shows, however, that Y(Fe, Co)O3 forms as a nanoparticulate dispersion throughout the film in preference to CoFe2O4, 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)O3 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 YFeO3 as an effective ferromagnetic pinning additive for YBCO. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Critical current Cuprate superconductors Flux pinning Magnetic pinning
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:40
Last Modified: 12 Dec 2014 19:04
DOI: 10.1016/j.physc.2009.10.117