Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Magnetic Thin Films I (Heusler Alloys)

MA 6.12: Vortrag

Montag, 22. März 2010, 17:30–17:45, H10

Dependence of domain width on second order anisotropy — •D. Stickler¹, R. Frömter¹, H. Stillrich¹, C. Menk¹, C. Tieg², C. Gutt³, S. Streit-Nierobisch³, L.-M. Stadler³, O. Leupold³, G. Grübel³, and H. P. Oepen³ — ¹Institut für Angewandte Physik, Jungiusstr. 11, 20355 Hamburg — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin — ³Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg

The domain width of magnetic films with uniaxial perpendicular anisotropy is a consequence of the interplay between magnetostatic and domain wall energy. We fit the analytical solution for the magnetostatic energy of single layers¹ to numerical results for multilayers², with the thickness and scaling factor for the magneto-static energy as fit parameters. With the achieved analytical description, we calculate the energy minimum as a function of domain width, by utilizing the domain wall energy expression for systems with considerable K₂-contribution³. The model is applied to our findings on soft x-ray Fourier transform holography of anisotropy modulated films of constant thickness⁴. The anisotropy was tuned via ion beam bombardment. The analysis reveals that close to reorientation K₂ determines the domain width, while changes in K₁ are responsible for the transitions of the magnetization from vertical to in-plane orientation.

¹Kaplan and Gehring, JMMM128, 111 (1993) ²Draaisma and deJonge, J.Appl.Phys.62, 3318 (1987) ³Träuble et al., Phys.Stat.Sol.10, 283 (1965) ⁴Streit-Nierobisch et al., J.Appl.Phys.106, 083909 (2009)