Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 18: Spintronics
MA 18.10: Talk
Tuesday, September 6, 2022, 17:15–17:30, H47
Chiral domain wall dynamics under applied current in cylindrical magnetic nanowires — •Jose A. Fernandez-Roldan1, Cristina Bran2, Manuel Vazquez2, and Oksana Chubykalo-Fesenko2 — 1Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden, Germany — 2Instituto de Ciencia de Materiales de Madrid, ICMM-CSIC, Madrid, Spain
The Bloch Point (BP) domain wall (DW) is known as an appealing information carrier for spintronics in Cylindrical Nanowires (NWs), owing to the velocity of nearly 2 km/s that the BP could reach in the magnonic regime [1-3]. Scarce numerical studies have been published combining both spin-polarized current and Oersted field in NWs [4], despite first attempts to measure the DW velocities are in progress [5].
Here we evaluate the BP dynamics under both spin-polarized current and Oersted-field in a Ni NW from i) a pre-nucleated BP DW, and from ii) a transformation of a Vortex-Antivortex DW.
We show that the pre-nucleated DW with the same chirality as that of the Oersted field propagates always against the current direction, while the BP originated either via a DW transformation or a chirality switching can either stop its propagation or move parallel to the current. Finally, we provide values of the velocities of the BP as a function of the current.
We conclude that BPs with vanishing momentum propagate opposite to the current with velocities that may are suppressed by the Oersted field. Importantly for spintronic applications, both momentum and inertial mass play a crucial role in the BP dynamics that has not been envisaged up to know.
[1] A. Fernandez-Pacheco et al., Three-dimensional nanomagnetism, Nat Commun 8, 15756 (2017)
[2] S. Da Col et al., Observation of Bloch-point domain walls in cylindrical magnetic nanowires, Phys. Rev. B 89, 180405 (2014)
[3] X.-P. Ma et al., Cherenkov-type three-dimensional breakdown behavior of the Bloch-point domain wall motion in the cylindrical nanowire, Appl. Phys. Lett. 117, 062402 (2020)
[4] J.A. Fernandez-Roldan et al., Electric current and field control of vortex structures in cylindrical magnetic nanowires, Phys. Rev. B 102, 024421 (2020)
[5] M. Schöbitz et al., Fast Domain Wall Motion Governed by Topology and Oersted Fields in Cylindrical Magnetic Nanowires, Phys. Rev. Lett. 123, 217201 (2019)