Influence of Structural and Magnetic Parameters on the Micromagnetic Behavior of Ferromagnetic and Core–Shell Nanowires

Ferromagnetic nanowires play a crucial role in emerging technologies, offering unique geometry-dependent magnetic properties that make them promising candidates for high-density data storage, spintronic devices, and biomedical applications [1-2]. On the other hand, micromagnetic simulations are a powerful tool for investigating magnetic materials, as the macroscopic magnetic behavior arises from complex interactions between individual magnetic moments. Such simulations enable the study of complex nanostructures, the design of spintronic devices, and the understanding of fundamental phenomena such as domain formation and motion. This work presents a micromagnetic study of simple ferromagnetic (FM) nanowires and core–shell nanowires composed of an FM core and an antiferromagnetic (AFM) shell, focusing on the influence of nanowire geometry, damping constant, and interfacial coupling on their magnetic behavior. Simulations are carried out using the Object Oriented MicroMagnetic Framework (OOMMF), with analysis based on magnetization maps and hysteresis loops. The parameters were systematically investigated for inspection of their influence on domain wall formation and structure, magnetization dynamics, and reversal mechanisms. For core–shell systems, the study examines how interfacial coupling and shell composition influence the overall magnetic response. The preliminary results provide insight into how the geometric aspects and properties of the material that comprises the nanowires can be utilized to tune their magnetic properties according to the application needs in more complex magnetic devices.

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[2] W. Zhou, J. Um, Y. Zhang, A. P. Nelson, Z. Nemati, J. Modiano, B. Stadler, R. Franklin. 2019, Development of a Biolabeling System Using Ferromagnetic Nanowires. IEEE Journal Of Electromagnetics, RF, and Microwaves in Medicine And Biology, vol. 3, no. 2, pp. 134-142. DOI: 10.1109/JERM.2018.2889049.