Ed below, the effortless the perpendicular direction towards a far more parallel one particular for Fe/Cu NWs with Fe and Cu segment lengths of 30 nm and 120 nm, respectively.Nanomaterials 2021, 11,8 ofTo confirm that the NWs exhibit distinctive magnetization Vorinostat Data Sheet reversal regimes as a function from the Fe segment aspect ratio, the study was complemented by performing 3-D micromagnetic simulations (MuMax3 software, Version 3.9.1) [42]. In this case, we’ve simulated multi-segmented individual NWs 40 nm in diameter, varying the Fe layer length from 20 to 300 nm, thinking about two diverse lengths for the non-magnetic Cu spacers (60 and 120 nm) and keeping the total quantity of bilayers fixed at 15. The micromagnetic simulations showed that the segmented Fe/Cu NWs behaved like a set of 15 non-interacting nanoparticles when the Fe and Cu spacer lengths were 30 and 120 nm, respectively (see inset in Figure 5d). Additionally, it was confirmed that the 30-nm-length Fe Sulfo-NHS-LC-Biotin Protocol segments (separated by 120 nm of Cu) exhibited a vortex configuration with around 60 in the magnetization pointing parallel towards the NW long axis. As soon because the Fe segment lengths had been increased (100 nm), when maintaining the Cu segments to 120 nm, the magnetic reversal mode occurred by means of the nucleation and propagation of a V-DW from the extremities of each segment (see insets in Figure 5e,f), similar to what happened in the longer cylindrical Fe NW (inset in Figure 3a). This behavior becomes extra evident as the Fe segments’ length is elevated. To study the impact of the non-magnetic Cu spacer layer, Fe/Cu NWs with Cu spacers 60 nm in length and Fe layers with lengths ranging from 20 to 260 nm were also simulated. The 3D simulated magnetic configuration at remanence in the Fe/Cu NWs with Fe segments 20 nm in length showed an easy magnetization axis lying perpendicular to the longitudinal NW’s axis (inset in Figure 5a). In addition, the magnetization in consecutive Fe segments is oriented in opposite directions, confirming the formation of a synthetic antiferromagnetic program with coercivity and remanence values close to zero (Figure 5a). As was observed in the samples with Cu spacer lengths of 120 nm, the magnetization reversal evolved from an in-plane (perpendicular) configuration for the nucleation and propagation of a V-DW in the extremities of every segment for NWs with longer Fe segments (60 nm). Table 1 summarizes the results obtained, which includes the lengths from the Fe segments together using the coercivity and normalized remanence values measured along each the parallel and perpendicular directions from the applied field. Additionally, the coercivity and reduced remanence values are also presented in Figure 6, as a function on the Fe segments’ length, taking into consideration the external magnetic field applied parallel for the NWs’ lengthy axis. Each the coercivity and remanence values had been located to progressively improve with escalating Fe length in the multi-segmented Fe/Cu NWs. Nevertheless, while the parallel coercivity elevated until the worth corresponding towards the extended Fe NW was reached (Figure 6b), the remanence values reached even larger values when when compared with the continuous Fe NW (Figure 6a). This may be ascribed towards the stronger magnetostatic interactions in between neighboring wires for the extended Fe NWs when when compared with multi-segmented Fe/Cu NWs, which lower the respective remanence values [55].Table 1. Magnetic properties of multi-segmented NWs: Coercive field (Hc) and normalized remanence (mr) measured using the magneti.
