Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.33: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Exchange shift of stripe domains in antiferromagnetically coupled superlattices — Nikolay S. Kiselev^1,2, Igor E. Dragunov², •Ulrich K. Rößler¹, and Alexei N. Bogdanov^1,2 — ¹IFW Dresden — ²Donetsk Institute for Physics and Technology

Recently synthesized antiferromagnetically coupled superlattices with perpendicular anisotropy display qualitatively new physical properties. Competition between the weak interlayer exchange and dipolar coupling yields unusual domain structures and magnetization processes. Understanding and control of these properties may lead to new applications of such perpendicular multilayers. Within a general phenomenological approach we calculate the existence regions and the geometrical parameters of equilibrium stripe and bubble domains, and their evolution in a bias field. A shifted phase characterized by a redistribution of magnetization between adjacent magnetic layers exists in a broad range depending on the ratio of magnetic and nonmagnetic layer thicknesses and strengths of interlayer coupling [1]. The transition from the antiferromagnetic monodomain state to the shifted phase and coexistence of metastable states was observed in recent experiments [2]. Qualitative and quantitative methods have been developed [3] for the analysis of magnetic force microscopy (MFM) images from this novel class of nanomagnetic systems.

[1] N.S. Kiselev, I. E. Dragunov, U. K. Rößler, A. N. Bogdanov, Appl. Phys. Lett. 91 (2007) 132507; [2] O. Hellwig et al. J. Magn. Magn. Mater. 319 (2007) 13; [3] N.S. Kiselev, I. E. Dragunov, V. Neu, U. K. Rößler, A. N. Bogdanov, J. Appl. Phys. submitted.