Phase diagrams of magnetic nanotubes

Escrig, Juan; Landeros, P.; Altbir, D.; Vogel, E.E.; Vargas, P.

doi:10.1016/j.jmmm.2006.05.019

Cited by 96 publications

(78 citation statements)

References 11 publications

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“…In particular, we show the experimental signatures of vortex end-domain nucleation in individual FNTs and reveal their dependence on the slant angle of the ends. Magnetization reversal in FNTs offers some potential advantages over the equivalent and well-understood process in ferromagnetic nanowires (NWs) [19][20][21]: In particular, the core-free geometry of FNTs has been predicted to favor uniform switching fields and high reproducibility [14,22,23]. Understanding and controlling the switching process in real FNTs is a crucial step toward enabling practical applications.…”

Section: Introductionmentioning

confidence: 99%

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

et al. 2018

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The reversal of uniform axial magnetization in a ferromagnetic nanotube (FNT) has been predicted to occur through the nucleation and propagation of vortex domains forming at the ends. We provide experimental evidence for this behavior through dynamic cantilever magnetometry measurements of individual FNTs. In particular, we identify the nucleation of the vortex end domains as a function of applied magnetic field and show that they mark the onset of magnetization reversal. We find that the nucleation field depends sensitively on the angle between the end surface of the FNT and the applied field. Micromagnetic simulations substantiate the experimental results and highlight the importance of the ends in determining the reversal process. The control over end-vortex nucleation enabled by our findings is promising for the production of FNTs with tailored reversal properties.

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Section: Introductionmentioning

confidence: 99%

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

et al. 2018

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“…18 Whether the equilibrium orientation of the spontaneous magnetization will adapt the vortex or the parallel state depends on nanotube geometry, crystal anisotropy energies and saturation magnetization of the magnetic material. 19,20 As it is shown in Figures 4(a) and 4(b), the first and second derivative of the magnetic field H x in the (y,z)-plane for these two magnetic states differ completely. Whereas the vortex state gives an opposing maximum and minimum of magnetic field along the z axis of the wire that is uniformly spread along the whole length of the tube, the parallel state leads to a significant magnetic field contribution at the ends of the Nw only.…”

Section: Single Nw Characterizationmentioning

confidence: 71%

Magnetic properties of GaAs-Fe3Si core-shell nanowires—A comparison of ensemble and single nanowire investigation

2017

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On the basis of semiconductor-ferromagnet GaAs-Fe3Si core-shell nanowires (Nws) we compare the facilities of magnetic Nw ensemble measurements by superconducting quantum interference device magnetometry versus investigations on single Nws by magnetic force microscopy and computational micromagnetic modeling. Where a careful analysis of ensemble measurements backed up by transmission electron microscopy gave no insights on the properties of the Nw shells, single Nw investigation turned out to be absolutely essential.

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“…Once this configuration is formed, it is hard to magnetize, which leads to the hysteresis loops being discontinuous in the corresponding field range. The existence of vortex configurations in magnetic nanotubes with a high aspect ratio has been reported in recent years [20][21][22]. When the applied field is perpendicular to the long axis of the Co nanotubes, the distribution of magnetic moments takes on the vortex state and corresponds to the curling mode [23].…”

Section: Resultsmentioning

confidence: 99%

Template-based synthesis and discontinuous hysteresis loops of cobalt nanotube arrays

Zhang

et al. 2013

J Mater Sci

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Co nanotubes were successfully prepared in the pores of anodic aluminium oxide templates using a DC electrodeposition method. The dependence of the product morphology on the applied potential was studied over the range -1.0 to -3.0 V. The results showed that the wall thickness of the nanotubes became thinner as the applied potential was reduced, and that there existed a critical potential (v c ) related to the electrodeposition parameters, below or above which the electrodeposition process is dominated by kinetics and thermodynamics, respectively. The formation of nanotubes is the result of kinetics dominating the electrodeposition process. Magnetic measurements showed that the hysteresis loops of the nanotubes were discontinuous. Theoretical analysis suggested the existence of some peculiar magnetization configuration such as a vertical Bloch line, which was responsible for the discontinuity of the hysteresis loops.

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Phase diagrams of magnetic nanotubes

Cited by 96 publications

References 11 publications

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

Magnetic properties of GaAs-Fe3Si core-shell nanowires—A comparison of ensemble and single nanowire investigation

Template-based synthesis and discontinuous hysteresis loops of cobalt nanotube arrays

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