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 (TC) and critical current (IC) 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 IC. The process of penetration and de-pinning of self-generated and externally excited magnetic vortices in such bridges is discussed.
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