Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 6: Magnetic Thin Films I (Heusler Alloys)
MA 6.12: Talk
Monday, March 22, 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)