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- W3104604940 abstract "The transport on top of a periodic two-dimensional hexagonal magnetic pattern of (i) a single macroscopic steel sphere, (ii) a doublet of wax/magnetite composite spheres, and (iii) an immiscible mixture of ferrofluid droplets with a perfluorinated liquid is studied experimentally and analyzed theoretically. The transport of all these magnetic objects is achieved by moving an external permanent magnet on a closed modulation loop around the two-dimensional magnetic pattern. The transport of one and also that of two objects per unit cell is topologically protected and characterized by discrete displacements of the particles as we continuously scan through a family of modulation loops. The direction and the type of transport is characterized by the winding numbers of the modulation loops around special objects in control space, which is the space of possible directions of the external magnetic field. The number of winding numbers necessary for characterizing the topological transport increases with the number of particles per unit cell. The topological character of the transport is destroyed when transporting a large collection of particles per unit cell like it is the case for a macroscopic assembly of magnetic nano particles in a ferrofluid droplet for which the transport is geometrical and no longer topological. To characterize the change in the transport from topological to geometrical, we perform computer simulations of the transport of an increasing number of particles per unit cell." @default.
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- W3104604940 date "2019-01-01" @default.
- W3104604940 modified "2023-09-23" @default.
- W3104604940 title "Hard topological <i>versus</i> soft geometrical magnetic particle transport" @default.
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- W3104604940 doi "https://doi.org/10.1039/c9sm01401b" @default.
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