Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.90: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Magneto-optical investigation of magnetic properties of patterned CoPt thin films with special edge profiles — •Jonas Norpoth, Sebastian Dreyer, Sven Schnittger, and Christian Jooss — Institut für Materialphysik, Universität Göttingen

The presence of edge roughness is of great importance for the magnetic properties of patterned structures. This work studies the influence of defined recesses in the edges of patterned CoPt thin films on the magnetic behavior like magnetization processes and strayfield distributions. We have systematically modified several geometrical parameters: the recesses have the shape of rectangles, triangles or half-cylindric solenoids. Furthermore their number and positions are varied, as well as the ratio of typical recess diameter to overall edge length. The epitaxially grown CoPt thin films (c-axis orientation) are patterned by e-beam lithography and subsequent ion etching. The specimens strayfield distribution is investigated by magneto-optical imaging (using the Faraday effect) up to a resolution of ~500nm; the obtained data is compared with theoretical calculations and is used to analyze the related magnetization distribution. In future prospects we think about a scale down of the patterns to the submicron length scale by means of Focused Ion Beam and Magnetic Force Microscopy.