DataVXACS Applied Nano MaterialsPaper
journal article·2019-08-23Open access

Ultradense Tailored Vortex Pinning Arrays in Superconducting YBa2Cu3O7−δThin Films Created by Focused He Ion Beam Irradiation for Fluxonics Applications

Bernd Aichner, Benedikt Müller, Max Karrer, Vyacheslav R. Misko, Fabienne Limberger, Kristijan L. Mletschnig, Meirzhan Dosmailov, Johannes D. Pedarnig, Franco Nori, Reinhold Kleiner, Dieter Koelle, Wolfgang Lang

ACS Applied Nano Materials· Volume 2· Issue 8
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Source abstract

Abstract

Magnetic fields penetrate a type II superconductor as magnetic flux quanta, called vortices. In a clean superconductor they arrange in a hexagonal lattice, while by addition of periodic artificial pinning centers many other arrangements can be realized. Using the focused beam of a helium ion microscope, we have fabricated periodic patterns of dense pinning centers with spacings as small as 70 nm in thin films of the cuprate superconductor YBa2Cu3O7−δ. In these ultradense kagomé-like patterns, the voids lead to magnetic caging of vortices, resulting in unconventional commensurability effects that manifest themselves as peaks in the critical current and minima in the resistance versus applied magnetic field up to ∼0.4 T. The various vortex patterns at different magnetic fields are analyzed by molecular dynamics simulations of vortex motion, and the magnetic field dependence of the critical current is confirmed. These findings open the way for a controlled manipulation of vortices in cuprate superconductors by artificial sub-100 nm pinning landscapes.
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Research context

OpenAlex topics: Physics of Superconductivity and Magnetism · Advanced Condensed Matter Physics · Magnetic properties of thin films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Faculty of Physics, University of Vienna, Wien, Austria

Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Tübingen, Germany

Department of Physics, Universiteit Antwerpen, Antwerpen, Belgium

Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama, Japan

μFlow group, Department of Chemical Engineering, Vrije Universiteit Brussel, Brussels, Belgium

Institute of Applied Physics, Johannes Kepler University Linz, Linz, Austria

Physics Department, University of Michigan, Ann Arbor, Michigan 48109, United States

Funding

Army Research Office · RIKEN · Core Research for Evolutional Science and Technology · Studienstiftung des Deutschen Volkes · Air Force Office of Scientific Research · Russian Foundation for Basic Research · Fonds Wetenschappelijk Onderzoek · European Cooperation in Science and Technology · Japan Society for the Promotion of Science · Japan Science and Technology Agency · National Institute of Advanced Industrial Science and Technology

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