Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.98: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Simulation of magnetic force microscopy of MnAs/GaAs(001) — •Roman Engel-Herbert, Jyoti Mohanty, and Thorsten Hesjedal — Paul-Drude-Institut, Hausvogteiplatz 5-7, 10117 Berlin, Germany

Magnetic force microscopy (MFM) is a commonly employed tool for the micromagnetic investigation of a sample, however, the quantitative interpretation and analysis of MFM experiments is difficult. We performed a more realistic simulation based on the extended tip model. This allows a more accurate description of the tip-sample interaction in the near-field, as compared to the commonly applied point-dipole model. Following this approach one is able to predict optimal scan parameters (working distance, oscillation amplitude of the cantilever) and tip properties for a given experimental problem. The simulation was applied to MnAs thin films that exhibit a self-organized array of ferromagnetic stripes in the phase-coexistence regime. The magnetic domain structure is governed by the strong uniaxial anisotropy and shape anistropy of the film that lead to simple domain configurations, where the magnetic moments are all aligned in-plane along the easy axis direction of the film. Therefore the individual domains can be approximated by bar magnets, for which we derived an analytical solution for the magnetic stray field.