title: Comment on "Self-assembly of magnetic balls: From chains to tubes".
abstract: The paper states that magnetic balls preferably assemble in a tube geometry if the number of particles exceeds N≥14. We find that for substantially higher particle counts, such as N>1300, a round cluster of densely packed magnetic balls with an fcc lattice can outmatch the described tube structure.
authors.affiliation: Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Friedrich
authors.affiliation: Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany.
authors.forename: Ingo
authors.initials: I
authors.lastname: Rehberg
authors.affiliation: Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Richter