Effect of Interactions and Non-uniform Magnetic States on the Magnetization Reversal of Iron Nanowire Arrays
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ORIGINAL PAPER
Effect of Interactions and Non-uniform Magnetic States on the Magnetization Reversal of Iron Nanowire Arrays I. S. Dubitskiy1 · A. H. A. Elmekawy2,3 · E. G. Iashina1 · S. V. Sotnichuk2,4 · K. S. Napolskii4,5 · D. Menzel6 · A. A. Mistonov2 Received: 13 July 2020 / Accepted: 29 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Ordered ferromagnetic nanowire arrays are widely studied due to the diversity of possible applications. However, there is still no complete understanding of the relation between the array’s parameters and its magnetic behavior. The effect of vortex states on the magnetization reversal of large-diameter nanowires is of particular interest. Here, we compare analytical and micromagnetic models with experimental results for three arrays of iron nanowires with diameters of 33, 52 and 70 nm in order to find the balance between the number of approximations and resources used for the calculations. The influence of the vortex states and the effect of interwire interactions on the remagnetization curves are discussed. It has been found that 7 nanowires treated by a mean field model are able to reproduce well the reversal behavior of the whole array in the case of large diameter nanowires. Vortex states tend to decrease the influence of the structural inhomogeneities on reversal process and thus lead to the increased predictability of the system. Keywords Micromagnetics · Iron nanowires · Vortex state · Hysteresis curve
1 Introduction The list of possible applications of magnetic nanowires is continuously expanding [1–5], which requires a deeper understanding of the remagnetization mechanism at the nanoscale. Long-term and fruitful studies of nanowire arrays have significantly improved the understanding of
I. S. Dubitskiy
[email protected] 1
Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre “Kurchatov Institute”, 1, Orlova roscha mcr., Gatchina, 188300, Leningrad Region, Russia
2
Department of Physics, Saint Petersburg State University, St. Petersburg, 198504, Russia
3
Cyclotron Project, Nuclear Research Center, Atomic Energy Authority, Cairo, 13759, Egypt
4
Department of Materials Science, Lomonosov Moscow State University, Moscow, 119991, Russia
5
Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia
6
Institute of Condensed Matter Physics, TU Braunschweig, Braunschweig, 38106, Germany
their magnetic properties [6–9]. The first models describing the magnetic properties of ferromagnetic nanowire arrays have been based on simple but convenient assumptions. The model of coherent rotation has been used to describe the remagnetization process and the interactions in the array have been taken into account by considering the nanowires as point dipoles [10, 11]. However, the improvement of synthesis methods [12–17] as well as the new capabilities to investigate individual wires [18–20] has shown that these models are often oversimplified. It has been found tha
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