Single-domain versus two-domain configuration in thin ferromagnetic prisms

Details Single-domain versus two-domain configuration in thin ferromagnetic prisms Single-domain versus two-domain configuration in thin ferromagnetic prisms

2006-10-09

arxiv.org/abs/cond-mat/0610233v1

Physics

Condensed Matter

Materials Science

22 pages, 5 figures

Scientific paper

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.

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