Micromagnetic Simulations of Anisotropies in Coupled and Uncoupled Ferromagnetic Nanowire Systems

The influence of a variation of spatial relative orientations onto the coupling dynamics and subsequent magnetic anisotropies was modeled in ferromagnetic nanowires. The wires were analyzed in the most elementary configurations, thus, arranged in pairs perpendicular to each other, leading to one-dimensional (linear) and zero-dimensional (point-like) coupling. Different distances within each elementary pair of wires and between the pairs give rise to varying interactions between parallel and perpendicular wires, respectively. Simulated coercivities show an exchange of easy and hard axes for systems with different couplings. Additionally, two of the systems exhibit a unique switching behavior which can be utilized for developing new functionalities

Моделирование диффузии водорода по границам зерен в титане

В результате исследования было определено, что коэффициенты диффузии, полученные методом молекулярной динамики, подчиняются уравнению Аррениуса, т.е. с ростом температуры увеличивается и коэффициенты диффузии. Результаты расчетов согласуются с экспериментальными данными и другими расчетами. Результаты исследований могут быть полезны для исследователей, изучающих системы металл-водород, а также в области материаловедения, авиаконструкция и водородной энергетики. Кроме того, для теоретиков, работающих в области молекулярно-динамических расчетов, данные расчеты позволят оценить границы применимости используемого потенциала взаимодействия.As a result of the study, it was determined that the diffusion coefficients obtained by the molecular dynamics method obey the Arrhenius equation, i.e. With increasing temperature, the diffusion coefficients also increase. The results of the calculations are consistent with the experimental data and other calculations. The results of the research can be useful for researchers studying metal-hydrogen systems, as well as in the field of materials science, aircraft construction and hydrogen energy. In addition, for theorists working in the field of molecular dynamics calculations, these calculations will make it possible to estimate the limits of applicability of the interaction potential use

Influence of clustering round magnetic nano-dots on magnetization reversal

Abstract Square and round magnetic nano-dots of varying dimensions exhibit a large amount of possible magnetization reversal processes, from domain wall nucleation and propagation to multi-vortex states. Clustering such single nano-dots, however, may strongly modify these magnetization reversal processes due to the interactions between neighboring particles. Here we thus investigate the difference between magnetization reversal processes in clusters of hexagonally arranged round nano-dots under different orientations of the external magnetic field in comparison with single particle behavior.</jats:p