Recently we reported a new way to manipulate vortices in thin superconducting films by local mechanical contact without magnetic field, current or altering the pinning landscape . We use scanning superconducting interference device (SQUID) microscopy to image the vortices, and a piezo element to push the tip of a silicon chip into contact with the sample. As a result of the stress applied at the contact point, vortices in the proximity of the contact point change their location. Here we study the characteristics of this vortex manipulation, by following the response of individual vortices to single contact events. Mechanical manipulation of vortices provides local view of the interaction between strain and nanomagnetic objects, as well as controllable, effective, localized, and reproducible manipulation technique.
 Berciu, M., T.G. Rappoport, and B. Janko,Manipulating spin and charge in magnetic semiconductors using superconducting vortices. Nature, 2005. 435(7038): p. 71-75. 10.1038/nature03559Search in Google Scholar
 Kalisky, B., et al., Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale. Applied Physics Letters, 2009. 94(20): p. 202504. 10.1063/1.3137164Search in Google Scholar
 Gutiérrez, J., et al., Strong isotropic flux pinning in solutionderived YBa2Cu3O7-x nanocomposite superconductor films. Nature materials, 2007. 6(5): p. 367-73. 10.1038/nmat1893Search in Google Scholar
 Llordés, A., et al., Nanoscale strain-induced pair suppression as a vortex-pinning mechanism in high-temperature superconductors. Nature Materials, 2012. 11(4): p. 329-336. 10.1038/nmat3247Search in Google Scholar
 Gardner, B.W., et al., Manipulation of single vortices in YBa2Cu3O6.354 with a locally applied magnetic field. Applied Physics Letters, 2002. 80(6): p. 1010-1012. 10.1063/1.1445468Search in Google Scholar
 Huber, M.E., et al., Gradiometric micro-SQUID susceptometer for scanning measurements of mesoscopic samples. Review of Scientific Instruments, 2008. 79(5): p. 053704. 10.1063/1.2932341Search in Google Scholar
 Pristáš, G., et al., Influence of hydrostatic pressure on superconducting properties of niobium thin film. Thin Solid Films, 2014. 556: p. 470-474. 10.1016/j.tsf.2014.01.062Search in Google Scholar
 Goldstein, M.J. and W.G. Moulton, Thermally induced flux motion and the elementary pinning force in Nb thin films. Physical Review B, 1989. 40(13): p. 8714-8719. 10.1103/PhysRevB.40.8714Search in Google Scholar
 Shapoval, T., et al., Quantitative assessment of pinning forces and magnetic penetration depth in NbN thin films from complementary magnetic force microscopy and transport measurements. Physical Review B, 2011. 83(21): p. 214517. 10.1103/PhysRevB.83.214517Search in Google Scholar
 Gubin, A.I., et al., Dependence of magnetic penetration depth on the thickness of superconducting Nb thin films. Physical Review B, 2005. 72(6): p. 064503. 10.1103/PhysRevB.72.064503Search in Google Scholar
©2016 Anna Kremen et al.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.