Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168495
Keywords
Magnetization; Nanowires; Domain wall
Funding
- Financiamiento para Centros de Excelencia [AFB180001]
- Spanish Ministry of Science and Innovation [PID2019-108075RB-C31/AEI/10.13039/501100011033]
- Natural Environment Research Council [NE/S011978/1]
- Brazilian agency CNPq [302084/2019-3]
- Brazilian agency Fapemig [RED-00428-16]
- NERC [NE/S011978/1] Funding Source: UKRI
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Understanding and mastering the magnetic properties of domain walls in cylindrical nanowires is crucial for developing 3D information technologies. This study accurately determines domain wall types and widths, presenting a state diagram based on nanowire diameter and material. The research findings provide valuable insights for experimental design and applications of cylindrical nanowires.
Understanding and mastering the magnetic properties of domain walls in cylindrical nanowires is a fundamental pillar for developing novel 3D information technologies. For this purpose, a good comprehension of domain wall (DW) dynamical properties, which are strongly dependent on its type and size, is needed. In this work, by means of micromagnetic simulations, we focus on the accurate determination of DW types (transverse, vortexantivortex, and the Bloch point) and DW widths and present a state diagram as a function of the diameter and the nanowire material. Using different initial states and trajectories we find a large region of metastability where the Bloch-point domain wall co-exists with either transverse or a more energetical vortex-antivortex one. We determine the domain wall width and its dependence on the nanowire diameter either for the transverse or the vortex-antivortex domain wall showing that it is always larger than the nanowire diameter. We also find simple expressions for the DW widths and the critical diameter for the transition between different DW types which agree well with direct simulations. Our results are useful for the experimental design of cylindrical nanowires for multiple applications.
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