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Pasquale, Massimo; Trabada, David Gonzales; Olivetti, Elena Sonia; Sasso, Carlo Paolo; Coisson, Marco; Magni, Alessandro; Sanchez, Felipe Garcia; Vazquez, Manuel
Journal of physics. D, Applied physics, 11/2023, Letnik: 56, Številka: 48Journal Article
Abstract We study the magnetic properties of arrays of Co nanowires which exhibit zero bias-field ferromagnetic resonance absorptions in a 0–30 GHz range. Columnar arrays of Co nanowires with lengths of 8–15 µ m were electrochemically grown using ∼20 µ m thick anodic alumina membranes with 50 nm pore diameters. Microstructural, static magnetic, and microwave properties of five different nanowire arrays were characterized. The studied Co nanowires present different crystal structure textures and magnetic properties. The static magnetic loop shapes and the ferromagnetic resonance frequencies of the nanowire arrays were correctly reproduced using the Mumax3 micromagnetic software. For each sample input parameters dependent on the x-ray diffraction and microstructural data, were fine-tuned to allow the best fit of the experimental hysteresis loops and the related microwave spectra. Using this method, it was possible to analyze the rather complex interplay between geometry and magneto-structural features of the different arrays, defining which parameters play a key role in the development of nano-systems with specific microwave properties.
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