Leap-frog transport of magnetically driven anisotropic colloidal rotors

Massana-Cid, Helena; Navarro-Argemí, Eloy; Levis, Demian; Pagonabarraga, Ignacio; Tierno, Pietro

doi:10.1063/1.5086280

Cited by 9 publications

(5 citation statements)

References 39 publications

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“…In this context, some of us recently investigate the dynamics of pair of propelling microrollers composed of anisotropic hematite particles that are driven close to a plane by an external rotating magnetic field. 25,26 In such system, hydrodynamic interactions (HIs) between the particles induce the formation of stable bound states, where the particles align tip to tip, namely with their relative position parallel to the long axis, even if dipolar forces are repulsive in this configuration. However, the collective effects generated by several interacting microrollers and how the produced flow field alters the global mean velocity remain still unclear.…”

Section: Introductionmentioning

confidence: 99%

Collective hydrodynamic transport of magnetic microrollers

2021

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Section: Introductionmentioning

confidence: 99%

Collective hydrodynamic transport of magnetic microrollers

2021

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“…Although we focus on skyrmions, our results should be applicable to other types of systems with a Magnus force or gyroscopic coupling in the presence of inhomogeneous disorder. Examples of such systems include colloidal rotators 82 , magnetically driven colloids [83][84][85] , vortices in superfluids 86,87 , and chiral active matter states [88][89][90] .…”

Section: Introductionmentioning

confidence: 99%

Shear banding, intermittency, jamming, and dynamic phases for skyrmions in inhomogeneous pinning arrays

Reichhardt

2020

Phys. Rev. B

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We examine driven skyrmion dynamics in systems with inhomogeneous pinning where a strip of strong pinning coexists with a region containing no pinning. For driving parallel to the strip, we find that the initial skyrmion motion is confined to the unpinned region and the skyrmion Hall angle is zero. At larger drives, a transition occurs to a phase in which motion also appears within the pinned region, creating a shear band in the skyrmion velocity, while the skyrmion Hall angle is still zero. As the drive increases further, the flow becomes disordered and the skyrmion Hall angle increases with drive until saturating at the highest drives when the system transitions into a moving crystal phase. The different dynamic phases are associated with velocity and density gradients across the pinning boundaries. We map out the dynamic phases as a function of pinning strength, skyrmion density, and Magnus force strength, and correlate the phase boundaries with features in the velocity-force curves and changes in the local and global ordering of the skyrmion structure. For large Magnus forces, the shear banding instability is replaced by large scale intermittent flow in the pinned region accompanied by simultaneous motion perpendicular to the direction of the drive, which appears as oscillations in the transport curves. We also examine the case of a drive applied perpendicular to the strip, where we find a jamming effect in which the skyrmion flow is blocked by skyrmion-skyrmion interactions until the drive is large enough to induce plastic flow. arXiv:1911.06719v1 [cond-mat.mes-hall]

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“…Such dynamic state has been simultaneously reported in experiments by Massana et al . with the hematite particles [33] …”

Section: Propelling Rotorsmentioning

confidence: 99%

Transport and Assembly of Magnetic Surface Rotors**

Tierno

Snezhko

2021

ChemNanoMat

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This minireview focuses on recent advances with surface magnetic rotors, namely field‐responsive spherical or anisotropic microparticles that translate close to, or are embedded in a confining surface. The application of external magnetic modulations allows these microscopic wheels to be remotely spun and steered while also tuning their interactions and inducing assembly from a collection of disordered, moving units. With optical microscopy one can observe and characterize the complex collective phenomena that emerge in dissipative colloidal systems driven far from equilibrium by external fields. From a technological point of view, magnetic surface rotors envisage implementation into microfluidic devices, and can be used for drug delivery, mixing as well as a model system for biological active matter.

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Leap-frog transport of magnetically driven anisotropic colloidal rotors

Abstract: Paper published as part of the special topic on Chemical Physics of Active Matter Note: This article is part of the Special Topic "Chemical Physics of Active Matter" in J. Chem. Phys.

Cited by 9 publications

References 39 publications

Collective hydrodynamic transport of magnetic microrollers

Collective hydrodynamic transport of magnetic microrollers

Shear banding, intermittency, jamming, and dynamic phases for skyrmions in inhomogeneous pinning arrays

Transport and Assembly of Magnetic Surface Rotors**

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