2017
DOI: 10.1103/physrevb.96.024507
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Excess of topological defects induced by confinement in vortex nanocrystals

Abstract: We directly image individual vortex positions in nanocrystals in order to unveil the structural property that contributes to the depletion of the entropy-jump entailed at the first-order transition. On reducing the nanocrystal size the density of topological defects increases near the edges over a characteristic length. Within this "healing-length" distance from the sample edge vortex rows tend to bend while towards the center of the sample the positional order of the vortex structure is what is expected for t… Show more

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Cited by 6 publications
(9 citation statements)
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“…The decorated structures were frozen, at length scales of order a 0 , at temperatures at which the pinning generated by disorder sets in [27,28]. This freezing temperature is some K below the temperature at which magnetic response becomes irreversible [29]. This lenghtscale is shorter than the relevant for the hyperuniformity analysis.…”
Section: Density Fluctuations: Experimental Resultsmentioning
confidence: 99%
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“…The decorated structures were frozen, at length scales of order a 0 , at temperatures at which the pinning generated by disorder sets in [27,28]. This freezing temperature is some K below the temperature at which magnetic response becomes irreversible [29]. This lenghtscale is shorter than the relevant for the hyperuniformity analysis.…”
Section: Density Fluctuations: Experimental Resultsmentioning
confidence: 99%
“…8 shows S(q) for different sample thicknesses at a fix vortex density a 0 /λ ab (T freez ) = 2 corresponding to a magnetic induction of ∼ 40 G. We considered λ ab (T freez ) ∼ 0.4 µm at the irreversibility temperature T irr (B ∼ 40 Gauss). This is the temperature at which pinning sets in, and the vortex structure is frozen at length-scales of a 0 [29]. The gray area indicates the q · λ ab (T freez ) range used for fitting α eff in our experimental S(q) data.…”
Section: Discussion and Perspectivesmentioning
confidence: 99%
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“…Black dots correspond to individual vortices decorated with magnetized Fe nanoparticles attracted to the cores due to their local field gradient. Regular vortex structures with an excess of topological defects induced by confinement [13] are observed for both, N and AN cuboids.…”
mentioning
confidence: 92%
“…[5][6][7][8][9] Surface effects in vortex nanocrystals affect its thermodynamic, structural and magnetic properties. [10][11][12][13] For instance, due to surface barriers, the field at which the first vortex penetrates, H P , [14,15] can be larger than the lower critical field H c1 (depending only on the penetration depth λ and the coherence length ξ of the material). This effect becomes more relevant when the surface-to-volume ratio of the number of vortices in nanocrystals enhances.…”
mentioning
confidence: 99%