Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Spin Structures and Magnetic Phase Transitions

MA 18.6: Talk

Wednesday, March 25, 2009, 11:30–11:45, HSZ 401

Stripes to bubble transition in Fe/Cu(001) observed using SEMPA in applied magnetic field — •Niculin Saratz, Andreas Lichtenberger, Urs Ramsperger, Thomas Bähler, and Danilo Pescia — Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland

Ultrathin Fe films on the Cu(001)-surface have a strong perpendicular magnetic anisotropy. The competition between the dipolar and the exchange interaction results in the formation of magnetic domains. The ground state in zero field consists of parallel stripes of alternating magnetization, whereas in an applied magnetic field the minority domains form bubbles in a homogeneous background of opposite magnetization.

We present the reversible transition from stripe- to bubble domains observed using SEMPA in applied magnetic DC field as a function of both, applied magnetic field and temperature. The associated phase diagram is mapped in T-H-space and an inverse behaviour of the transition line is observed.