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Publication Citation: Magnetic Reversal of Ultra-Thin Films with Planar Magnetization

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Author(s): R Hyman; A Zangwill; Mark D. Stiles;
Title: Magnetic Reversal of Ultra-Thin Films with Planar Magnetization
Published: August 25, 1999
Abstract: Classical spin simulations are used to study magnetic reversal in ultra-thin (1-6 monolayers) films with planar magnetization and surface roughness typical of epitaxially grown samples. Reduced site symmetry at surface steps leads to strong, local anisotropies that both nucleate reversal and pin domain wall motion. The results we obtain from realistic models with periodic roughness are interpreted using a much simpler model with a single, finite-length step. These models show how growth induced roughness can lead to oscillations in the coercive field as the film thickness is increased, as seen in some experiments. they also demonstrate explicitly how local step anisotropies became less important and magnetostatic interactions become more important as the film thickness increases.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Volume: 60
Issue: 21
Pages: pp. 14830 - 14836
Keywords: anisotropy;coercivity;hysteresis;magnetization reversal;surface roughness
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (186KB)