Patterning of YBCO thin films by ion implantation and magneto-optical investigations

Abstract

YB~,CLI,O,-~ thin films deposited by pulsed laser deposition were patterned by ion implantation. The pa~terning technique is based on the local disordering of the crystal structure due to elastic collisions of the imp1,mted 0'"-ions and thus . on a strong breakdown of superconductivity in the irradiated areas. With tkis patterning method circular and meandering structures with a size of 1 rnm were prepared for invesuga~ions regarding high current applications. Oi-ions with an energy of 180 keV were used to avoid a contamination of the film. The achieved structures were investigated concerning a dependence on the dose by means of RBS, XRD, A M and magneto-optical characterization. Using a fluence of 5 x 1 0 '~ O+/cm2 a fully planar and stable s~ructure can be obtained. The patterning depth can be adjusted by varying the implantation energy. So thjs technique was also used successfully on YBCO thin films covered already wi tll a 300 ntn Au lop layer. O 1998 Elsevier Science 8.V.

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

“…Special conductor designs are needed to minimize the conductor's susceptibility to large AC losses on perpendicular field. In particular, the subdivision of the RE123 layer into parallel filaments along the tape axis has been explored at laboratory scale either using subtractive processes, e.g., chemical etching [47], ion implantation [48] and laser ablation [49] or by direct printing of multifilamentary structures through ink jet deposition [50]. The typical width of the RE123 strips is in the order of 100 μm, with an inter-stripe separation of ∼100 nm.…”

Ion implantation of rare-earth dopants in ferromagnetic thin films

“…The ability to pattern precessional characteristics at submicron length scales, possible using focused ion beams or implantation through lithographic masks, 13 can enable magnetic nanostructures with high-speed phenomena. Spin-wave analogies of a photonic crystal ͑magnonic crystal͒ may be realizable through a periodic array of high-␣ regions.…”

Generation of 25 T with an all-superconducting magnet system: field profile and field quality measurements of a layer-wound 4 T REBCO insert coil for a 21 T LTS magnet

“…• Dividing REBCO coated conductors into several narrow strips reduces the SCIF proportionally to the number of created segments. These are referred to as 'striations' and have been successfully demonstrated through different methods [46][47][48]. • Alignment of the field of the outsert with the insert's HTS tape surface reduces the cross-sectional area penetrated by the field, thus lowering the magnetization and the resulting SCIF.…”