Numerical Investigation of Stripe Structures in Ferromagnetic Thin Films with Perpendicular Anisotropy

概要

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Stripe structures in ferromagnetic thin films with perpendicular anisotropy and quality factor Q < 1 are numerically investigated using energy minimization. This formulation is applied to films with NiFe-type material parameters, high anisotropy (O(100) Oe) and thickness in the range of 〜 1000 - 2500 Å. For a given thickness, these films undergo a transition from a uniform in-plane state to a stripe state characterized by periodic out-of-plane tilt of magnetization as the anisotropy is increased above a critical value. The critical anisotropy decreases with increasing thickness; this critical relationship is calculated and is found to agree well with previous analytic results. The ratio of the stripe-state wavelength to film thickness is 2 on the critical focus but decreases as either the anisotropy or the film thickness is increased. The stray field outside the film surface has an amplitude O(10) Oe and submicron period.
社団法人応用物理学会の論文
1993-09-15