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Addition of ferromagnetic CoFe<inf>2</inf>O<inf>4</inf> 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 CoFe<inf>2</inf>O<inf>4</inf> to YBCO thin films for enhanced flux pinning. Physica C: Superconductivity and its Applications, 470. ISSN 0921-4534

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Abstract

An attempt has been made to prepare a YBa Cu O (YBCO) thin film doped with ferromagnetic CoFe O . Transmission electron microscopy of the resultant samples shows, however, that Y(Fe, Co)O forms as a nanoparticulate dispersion throughout the film in preference to CoFe O , 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 . Magnetic measurements indicate however that the Y(Fe, Co)O 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 as an effective ferromagnetic pinning additive for YBCO. © 2009 Elsevier B.V. All rights reserved. 2 3 7-δ 2 4 3 2 4 3 3 -2

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:24
Last Modified: 15 Apr 2021 05:37
DOI: 10.1016/j.physc.2009.10.117