Phys. Rev. Lett. 85, 5464–5467 (2000)Planar Magnetic Colloidal CrystalsReceived 14 June 2000; published in the issue dated 18 December 2000 We report a novel form of planar magnetic colloidal crystals formed by coated magnetic microspheres floating on a liquid meniscus. Under an external magnetic field, the balance between the repulsive magnetic interaction and the “attractive” interaction, due to the weight of the particles projected along the surface tangent, yields not only the triangular lattice with a variable lattice constant, but also all the other planar crystal symmetries such as the oblique, centered-rectangular, rectangular, and square lattices. By using two different sized magnetic particles, local formations of 2D quasicrystallites with fivefold symmetry are also observed. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.5464
DOI:
10.1103/PhysRevLett.85.5464
PACS:
82.70.Kj, 64.70.Kb, 75.50.Mm, 83.80.Gv
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