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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.44: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Stripe domain patterns in non-centrosymmetric ultrathin Fe/Ni-films on Cu(001) — •Thomas Meier, Matthias Kronseder, Michael Zimmermann, and Christian Back — Institut für experimentelle und angewandte Physik, Universität Regensburg, Deutschland

In ultrathin ferromagnetic films with perpendicular anisotropy a spin-reorientation transition from out-of-plane to in-plane orientation of the magnetization vector may occur. The competition of exchange and dipole interaction leads to the formation of stripe domain patterns in the vicinity of the spin reorientation transition. Here, we investigate fluctuations of domain patterns in ultrathin epitaxial Ni/Fe-bilayer- and trilayer-films grown on Cu(001) using the technique of threshold photoemission magnetic circular dichroism in combination with photoemission electron microscopy allowing real-time observation of the domain pattern and its dynamics. The breaking of the inversion symmetry by the interfaces leads to the emergence of the Dzyaloshinski-Moriya-interaction (DMI). Here we analyze the influence of the DMI on the domain pattern and develop an improved domain model including the DMI based on the theory of Kashuba et al. (Phys. Rev. B 48(14), 10335), which describes the evolution of the domain width depending on the perpendicular anisotropy. Furthermore we analyze the strength of fluctuations with respect to temperature and externally applied out-of-plane magnetic fields.