Penetration and de-pinning of vortices in sub-micrometer Ba(Fe,Co)₂As₂ thin film bridges

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• 作者：Dagmar Rall ; Laura Rehm ; Konstantin Il¡¯in ; Michael Siegel ; Kazumasa Iida ; Silvia Haindl ; Fritz Kurth ; Bernhard Holzapfel ; Ludwig Schultz ; Jie Yong ; Thomas Lemberger
• 关键词：Ferroarsenide ; Thin film devices ; Vortex penetration ; Superconducting transport current
• 刊名：Physica C
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：479
• 期：Complete
• 页码：164-166
• 全文大小：332 K

文摘

For the development of superconducting electronic devices made from iron-arsenide superconductors, thin films have to be patterned into sub-micrometer sized structures while retaining high superconducting transition temperature (T_C) and critical current (I_C) values. To investigate current transport properties, we structure Ba(Fe,Co)₂As₂ thin films with and without Fe buffer layers into ¦Ìm- and sub-¦Ìm-bridges and measure the temperature- and field-dependent I_C. The process of penetration and de-pinning of self-generated and externally excited magnetic vortices in such bridges is discussed.