Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.75: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Magnetization processes in highly coercive, epitaxial SmCo5 elements — •Volker Neu, Ulrike Wolff, Aarti Singh, Felix Fleischhauer, Sebastian Fähler, and Ludwig Schultz — IFW Dresden, P.O. Box: 270116, 01171 Dresden, Germany
Highly coercive, epitaxial SmCo5 films with unique in-plane alignment of the easy magnetization axis were prepared by pulsed laser deposition on Cr buffered MgO(110) single crystal substrates (µ0Hc = 2 to 3 T). Despite the good orientation of neighboring grains, these films possess a very small scaled domain structure in the as prepared state. Magnetic force microscopy (MFM) studies have been performed in the remanent state on structured 10µm x 10µm elements after applying increasingly higher magnetic fields. The magnetization process proceeds slowly and without the formation of larger domains until fields exceed 1 T. Changes are most pronounced between 1.2 T and 1.6 T, i.e. about 0.6 Hc. Close to saturation, the element is almost fully magnetized, as seen from contrast free inner areas and charge build-up at the element edges, but for small isolated areas. We interpret this behavior as a pinning dominated magnetization process with a large pinning density. The defect distance is estimated from the size of the smallest observable isolated magnetic domains and is of the order of 50 nm for a film thickness of likewise value. This observation offers an explanation for the high coercivities of these well textured films and is of importance for the possible use in magnetic recording applications. There, a new concept of percolated media is based on granular, exchange coupled materials with high pinning density.