title: Monolayer to bilayer transition in a dipolar system.
abstract: We study the transition from a one-dimensional magnetic dipolar monolayer to a bilayer as it is compressed beyond the close-packed condition. The pressure in a close-packed monolayer is found to be nearly independent of the number of dipoles. In the case of weak dipolar interactions, our experimental results indicate that the bilayer formation is governed by short-range steric and electrostatic repulsion, whereas for strong dipolar interactions the bilayer formation is governed by long-range dipolar repulsion.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.
authors.forename: L E
authors.initials: LE
authors.lastname: Helseth
authors.forename: T H
authors.initials: TH
authors.lastname: Johansen
authors.forename: T M
authors.initials: TM
authors.lastname: Fischer