BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Fabrication of 3D nanoarchitectures by focused particle beams DTSTART;VALUE=DATE-TIME:20190523T120000Z DTEND;VALUE=DATE-TIME:20190523T123000Z DTSTAMP;VALUE=DATE-TIME:20261013T043100Z UID:indico-contribution-610@indico.knu.ua DESCRIPTION:Speakers: Oleksandr Dobrovolskiy (Physikalisches Institut Goet he University Frankfurt am Main)\nExtending 2D structures into the third d imension has become a general trend in various areas\, including photonics \, plasmonics and magnetics. This approach provides a means to modify conv entional and to launch novel functionalities by tailoring vector potential s inducing anisotropic and chiral effects. Recently\, there has been signi ficant progress [1] in the fabrication of free-standing ferromagnetic and superconducting nanostructures by focused particle direct-write techniques \, as in part reviewed in [2]. In this respect\, 3D shell structures such as framed tubes\, spheres\, Swiss rolls and helices are especially interes ting as they offer unprecedented prospects for nanomagnetism [3] and super conductivity [$4$] because of topology and geometry-controlled effects. Na mely\, in magnetism\, curvilinear geometry brings about two exchange drive n interactions - effective anisotropy and antisymmetric vector exchange\, i.e. an effective Dzyaloshinskii-Moriya interaction. In addition\, another magneto-chiral contribution emerges due to the dipole-dipole interaction. In the case of superconducting nanostructures\, the combination of low-di mensionality with a curvilinear geometry allows in principle for the obser vation of topology-driven effects\, such as unconventional phase slips\, r eversible and irreversible switching\, fractional flux-flow instabilities\ , and the Berezinskii-Kosterlitz-Thouless transition. \n\nIn my talk\, I w ill introduce focused ion and electron beam-induced deposition\, FIBID and FEBID\, respectively\, as direct-write techniques suitable for the fabric ation of free-standing 3D nanoarchitectures with a resolution in the sub-n m range vertically and 10-20 nm laterally. Next\, I will dwell on selected proof-of-concept experiments\, technological limitations\, and future pro spects of using 3D hybrid ferromagnet / superconductor structures with pr e-defined shape and curvature in such research areas as microwave engineer ing [5]\, superconducting spintronics [6]\, magnon fluxonics [7]\, as well as graded-refractive-index spin-wave nano-optics [8].\n\nThis work was co nducted within the framework of the Actions CM1301 "Chemistry for electron -induced nanofabrication" (CELINA) and CA16218 "Nanoscale coherent hybrid devices for superconducting Quantum technologies" (NANOCOHYBRI) of the Eur opean Cooperation in Science and Technology (e-COST).\n\n[1] L. Keller et al.\, Direct-write of free-form building blocks for artificial magnetic 3D lattices\, Sci. Rep. 8 (2018) 6160.\n[2] M. Huth\, F. Porrati\, O. V. Dob rovolskiy\, FEBID meets materials science\, Microelectron. Engin. 185-186 (2018) 9.\n[3] R. Streubel et al.\, Magnetism in curved geometries\, J. Ph ys. D: Appl. Phys. 49 (2016) 363001.\n[4] S. Lösch et al.\, Microwave rad iation detection with an ultra-thin and free standing superconducting niob ium nano-helix\, [ACS Nano (2019)][1a]. \n[5] O. V. Dobrovolskiy et al.\, Microwave emission from superconducting vortices in Mo/Si superlattices\, Nat. Comms. 9\, 4927 (2018).\n[6] K.-R. Jeon et al.\, Enhanced spin pumpin g into superconductors provides evidence for superconducting pure spin cur rents\, Nat. Mater. 17 (2018) 499. \n[7] O. V. Dobrovolskiy et al.\, Magno n-Fluxon interaction in a ferromagnet/superconductor heterostructure\, [Na t. Phys. (2019)][2a].\n[8] C. S. Davies et al. Towards graded-index magnon ics Phys. Rev. B 92 (2015) 020408.\n\n\n [1a]: https://pubs.acs.org/doi/a bs/10.1021/acsnano.8b07280\n [2a]: https://doi.org/10.1038/s41567-019-042 8-5\n\nhttps://indico.knu.ua/event/4/contributions/610/ LOCATION: URL:https://indico.knu.ua/event/4/contributions/610/ END:VEVENT END:VCALENDAR