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Comment: Comment to: Samir Lounis, Peter H. Dederichs, and Stefan Bluegel, Phys. Rev. Lett. 101, 107204 (2008) (see http://link.aip.org/link?prl/101/107204)
Comment: 4 pages. Corrected a few misprints and improved figures' legibility. Accepted for publication in Physical Review B
Thin ferromagnetic elements in the form of rectangular prisms are theoretically investigated in order to study the transition from single-domain to two-domain state, with changing the in-plane aspect ratio p. We address two main questions: first, how general is the transition; second, how the critical value p_c depends on the physical parameters. We use two complementary methods: discrete-lattice calculations and a micromagnetic continuum approach. Ultrathin films do not appear to split in two domains. Instead, thicker films may undergo the above transition. We have used the continuum approach to analyze recent Magnetic Force Microscopy observations in 30 nm-thick patterned Permalloy elements, finding a good agreement for p_c.
Comment: Latex file, 12 pages, 3 figures. Article accepted for publication in European Physical Journal (EPJ) B
Comment: Several short parts have been rewritten. Accepted for publication as a Rapid Communication in Phys. Rev. B
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