Gment of the nanowire.Figure 5. MOKE Hysteresis Loops SBFI-AM Purity & Documentation measured around the narrow (black) and (black) segment of (red) segment FeCo Figure five. MOKE Hysteresis Loops measured around the narrowwide (red)and wide single bisegmentedof single W-19-d4 Purity & Documentation nanowires using the applied magnetic field along the nanowires extended axis: The inset shows a SEM image with the measured bisegmented FeCo nanowires with the applied magnetic field along the nanowires long axis: The nanowire highlighting the narrow (black arrow) and wide (red arrow) segments. inset shows a SEM image of the measured nanowire highlighting the narrow (black arrow) and wide (red arrow) segments. three.3. Micromagnetic Modelling with the Reversal Approach and MOKE ModelThe modelled hysteresis loop of Figure 6a reveals a complex reversal course of action that begins with gradual modifications of magnetization, together with the applied field starting from satTo measure the MOKE HL of single isolated bisegmented Fe67Co33 nanowires, they uration up to remanence (labels from 1 to two), and an irreversible magnetization jump have been dispersed onto at little adverse applied fields close to remanence (from two to 3). A closer inspection the surface of a prepatterned Si substrate in an effort to determine the measured nanowires.of the magnetic configuration in thecorresponding toin Figure 6b (1) suggests that In Figure five the MOKE HL nanowire displayed the narrow and wide the magnetization reversal begins together with the nucleation of a pair ofshown. In case of segments of a single isolated diameter modulated Fe67Co33 nanowire are vortex structures with opposite chirality along the entire length in the wide segment. These vortex structures the loop of your narrow segment, the magnetization reversal is carried outthe nanowire axis (disconsist of a core wherein the magnetization is aligned parallel to homogeneously at a switching field ofplayed in red color) and a the other hand, the MOKE HL in the wide nanaround 640 Oe. On shell wherein the magnetization rotates around the core (also named vortex tubes [23,49,50]). Such vortex structures have been experimentally reported owire segment constantly displays a two-step magnetization reversal, becoming the very first a single in X-ray magnetic circular dichroism photos in wires with notches [35,53] and predicted magnetically softer (250 Oe), whilst the other magnetization jump coincidestubes are spaced in wires with periodical modulations in diameter [50]. These vortex with all the reversal at the very same switching field value of your narrow segment on the nanowire. by a topologically non-trivial magnetic domain wall (DW), exactly where the magnetization has a massive element perpendicular for the nanowire lengthy axis. As the reverse magnetic field increases in 3.3. Micromagnetic Modelling ofin bluestrength, the magnetization in theModel into a three-dimensional (3D) the Reversal Method and MOKE shell on the wider segment reverses (displayed colour) and the tubes gradually transform skyrmion tube state, as depicted6a Figure 6b (two). complex reversal process that The modelled hysteresis loop of Figure in reveals a This structure is topologically protected and evidences a corkscrew pinning mechanism that manifests via begins with gradual modifications of magnetization, using the applied field startingthe helical core from satuof the tube [50]. Importantly, right here, the corkscrew pinning is uniquely induced by the ration up to remanence (labels from diameter inand an for the final results in Refs. [49,50]. Secondly, note that single modulation in 1 to 2), contrast irreversi.
