Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.8: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Stripe and bubble domain formation and transformation in Ni/Fe/Cu(001) — •Thomas Meier, Matthias Kronseder, and Christian Back — Institut für experimentelle und angewandte Physik, Universität Regensburg, Deutschland

In ultrathin ferromagnetic films with perpendicular magnetic anisotropy a spin-reorientation transition from out-of-plane to in-plane magnetization may occur. The competition of the domain wall energy and the dipole interaction leads to a rich variety of domain patterns in the vicinity of this spin reorientation transition. We investigate chiral magnetic domain patterns stabilized by the Dzyaloshinskii-Moriya interaction (DMI) in Cu- and Pt- capped Ni/Fe/Cu(001) samples with different DMI-constants depending on effective anisotropy, temperature and external magnetic fields. Phase diagrams of the magnetic domain pattern are recorded for both sample types and by scaling the magnetic field a universal phase diagram for perpendicularly magnetized systems depending only on the stripe domain width in zero field and the external magnetic field is obtained. By real-time imaging of the domain pattern using a high-speed camera we investigate the transition between bubble and stripe domain patterns dependent on external magnetic field and temperature. We found that due to the chiral nature of the domain walls merging and splitting of stripe segments may be strongly suppressed at room temperature depending on the stripe width, whereas a larger temperature of approx. 90^∘C allows the transformation from bubbles to stripes and vice versa in an experimentally accessible time scale.