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Domain wall propagation and pinning induced by current pulses in cylindrical modulated nanowires.

  • Bran, C1
  • Fernandez-Roldan, J A2
  • Moreno, J A3
  • Fraile Rodríguez, A4, 5
  • Del Real, R P1
  • Asenjo, A1
  • Saugar, E1
  • Marqués-Marchán, J1
  • Mohammed, H3
  • Foerster, M6
  • Aballe, L6
  • Kosel, J3, 7
  • Vazquez, M1
  • Chubykalo-Fesenko, O1
  • 1 Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, 28049, Spain. [email protected]. , (Spain)
  • 2 Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328 Dresden, Germany. , (Germany)
  • 3 King Abdullah University of Science and Technology, Computer Electrical and Mathematical Science and Engineering, Thuwal 23955-6900, Saudi Arabia. , (Saudi Arabia)
  • 4 Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, 08028, Spain. , (Spain)
  • 5 Institut de Nanociencia i Nanotecnologia (IN2UB), Universitat de Barcelona, Barcelona, 08028, Spain. , (Spain)
  • 6 ALBA Synchrotron Light Facility, CELLS, Barcelona, 08290, Spain. , (Spain)
  • 7 Silicon Austria Labs, Villach 9524, Austria. , (Austria)
Published Article
The Royal Society of Chemistry
Publication Date
Apr 24, 2023
DOI: 10.1039/d3nr00455d
PMID: 37092798


The future developments in 3D magnetic nanotechnology require the control of domain wall dynamics by means of current pulses. While this has been extensively studied in 2D magnetic strips (planar nanowires), few reports on this exist in cylindrical geometry, where Bloch point domain walls are expected to have intriguing properties. Here, we report an investigation on cylindrical magnetic Ni nanowires with geometrical notches. An experimental work based on synchrotron X-ray magnetic circular dichroism (XMCD) combined with photoemission electron microscopy (PEEM) indicates that large current densities induce domain wall nucleation, while smaller currents move domain walls preferably antiparallel to the current direction. In the region where no pinning centers are present, we found a domain wall velocity of about 1 km s-1. Thermal modelling indicates that large current densities temporarily raise the temperature in the nanowire above the Curie temperature, leading to nucleation of domain walls during the system cooling. Micromagnetic modelling with a spin-torque effect shows that for intermediate current densities, Bloch point domain walls with chirality parallel to the Oersted field propagate antiparallel to the current direction. In other cases, domain walls can be bounced from the notches and/or get pinned outside their positions. We thus found that current is not only responsible for domain wall propagation, but also is a source of pinning due to the Oersted field action.

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