A platform for nanomagnetism – assembled ferromagnetic and antiferromagnetic dipolar tubes

Stanković, Igor; Dašić, Miljan; Otálora, Jorge A.; García, Carlos

doi:10.1039/c8nr06936k

Cited by 9 publications

(3 citation statements)

References 65 publications

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“…In turn, magnetic anisotropy changes the way particles assemble. [18][19][20][21][22] In consequence, for sub-25 nm magnetic NPs in suspension, the dominant interaction changes from anisotropic, long-range, and oriented dipole-dipole coupling to the van der Waals short-range surface coupling. 23,24 The potential of magnetic nanocubes to form mesoscopic structures with different geometries is enormous.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous in-flight assembly of magnetic nanoparticles into macroscopic chains

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Spontaneous in-flight assembly of magnetic nanoparticles into macroscopic chains

et al. 2019

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“…However, above the critical size m c , the dipoles align with the tube's axis and a global reorganization of all dipoles, as described in [22], takes place. In figure 5, the SA curve diverges from the circular case as m increases.…”

Section: Dipole Reorientation In Growing Magnetotubesmentioning

confidence: 99%

Collective dipole reorganization in magnetostructures

2023

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Neodymium spherical magnets are inexpensive objects that demonstrate how dipolar particles self-assemble into various structures ranging from 1D chains to 3D crystals. Assemblies of these magnets are nicknamed magnetostructures and this paper focuses on a variety called magnetotubes, which are some curved square lattices forming cylinders. We experimentally and numerically observe that such magnetotubes can self-buckle, above a critical aspect ratio. In fact, the underlying dipolar ordering of such structures is found to exhibit a collective reorganization, altering the mechanical stability of the entire system. We identify the conditions in which these phenomena occur, and we emphasize that metastable states coexist. This suggests that a wide variety of magnetostructures, including chains and magnetocrystals, may collapse due to the coexistence of multiple ground states and global reorientation of dipoles.

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“…Even more appealing is the idea of tubular structures having as magnetic entities not atoms but lattices of nanoparticles 44,45 , clusters or even single-molecule magnets 46,47 that can be achieved by the controlled deposition on a surface template (e.g. carbon nanotubes 48 ).…”

Section: Introductionmentioning

confidence: 99%

Tailoring dual reversal modes by helicity control in ferromagnetic nanotubes

2020

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We investigate the effects of the competition between exchange (J) and dipolar (D) interactions on the magnetization reversal mechanisms of ferromagnetic nanotubes. Using first atomistic Monte Carlo (MC) simulations for a model with Heisenberg spins on a cylindrical surface, we compute hysteresis loops for a wide range of the γ = D/J parameter, characterizing the reversal behavior in terms of the cylindrical magnetization components and the vorticity parameter along the tube length. For γ's close to the value for which helical (H) states are stable at zero applied field, we show that the hysteresis loops can occur in four different classes that are combinations of two reversal modes with well-differentiated coercivities with probabilities that depend on the tube length and radius. This variety in the reversal modes is found to be linked to the metastability of the H states during the reversal that induce different paths followed along the energy landscape as the field is changed. We further demonstrate that reversal by either of the two modes can be induced by tailoring the nanotube initial state so that vortices with equal or contrary chirality are formed at the ends, thus achieving low or high coercive fields at will without changing γ. Finally, the results of additional micromagnetic simulations performed on tubes with similar aspect ratio show that dual switching modes and its tailoring can also be observed in tubes with more microscopic dimensions. arXiv:1904.05116v1 [cond-mat.mtrl-sci]

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A platform for nanomagnetism – assembled ferromagnetic and antiferromagnetic dipolar tubes

Cited by 9 publications

References 65 publications

Spontaneous in-flight assembly of magnetic nanoparticles into macroscopic chains

Spontaneous in-flight assembly of magnetic nanoparticles into macroscopic chains

Collective dipole reorganization in magnetostructures

Tailoring dual reversal modes by helicity control in ferromagnetic nanotubes

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