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

Stuart C. Wimbush; Rong Yu; Rantej Bali; John H. Durrell; Judith L. MacManus-Driscoll

doi:10.1016/j.physc.2009.10.117

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

Stuart C. Wimbush
, Rong Yu
, Rantej Bali
, John H. Durrell
, Judith L. MacManus-Driscoll

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

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.

Original language	English
Pages (from-to)	S223-S224
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.10.117
State	Published - Dec 2010
Externally published	Yes

Keywords

Critical current
Cuprate superconductors
Flux pinning
Magnetic pinning

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10.1016/j.physc.2009.10.117

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@article{93d6108885bc404382cbba082dfc211a,

title = "Addition of ferromagnetic CoFe2O4 to YBCO thin films for enhanced flux pinning",

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.",

keywords = "Critical current, Cuprate superconductors, Flux pinning, Magnetic pinning",

author = "Wimbush, \{Stuart C.\} and Rong Yu and Rantej Bali and Durrell, \{John H.\} and MacManus-Driscoll, \{Judith L.\}",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.10.117",

language = "英语",

volume = "470",

pages = "S223--S224",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

number = "SUPPL.1",

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TY - JOUR

T1 - Addition of ferromagnetic CoFe2O4 to YBCO thin films for enhanced flux pinning

AU - Wimbush, Stuart C.

AU - Yu, Rong

AU - Bali, Rantej

AU - Durrell, John H.

AU - MacManus-Driscoll, Judith L.

PY - 2010/12

Y1 - 2010/12

N2 - 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.

AB - 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.

KW - Critical current

KW - Cuprate superconductors

KW - Flux pinning

KW - Magnetic pinning

UR - https://www.scopus.com/pages/publications/78649710030

U2 - 10.1016/j.physc.2009.10.117

DO - 10.1016/j.physc.2009.10.117

M3 - 文章

AN - SCOPUS:78649710030

SN - 0921-4534

VL - 470

SP - S223-S224

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.1

ER -

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

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Keywords

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