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 15.79: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Structural, magnetic and magneto-optical properties of novel nanocrystalline face centered cubic Co1-xCrx/Pt multilayers with perpendicular anisotropy — •Evangelos Papaioannou¹, Christoph Rüdt¹, Paul Fumagalli¹, Panagiotis Poulopoulos², Makis Angelakeris³, and Nikolaos Flevaris³ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14,D-14195 Berlin-Dahlem, Germany — ²Materials Science Department, University of Patras, 26504 Patras, Greece — ³Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Co1-xCrx alloyed layers are combined with extremely thin Pt layers in order to produce novel face centered cubic multilayered films to be considered as a potential perpendicular magnetic recording medium. The films were grown on Si, glass and polyimide substrates by e-beam evaporation at a temperature slightly higher than the room temperature. The multilayered structure of the films was checked by x-ray diffraction experiments. Plane view transmission electron microscopy images have revealed the formation of very small grains in the range of 7-9 nm. Hysteresis loops as a function of temperature were recorded by means of the magneto-optical Kerr effect. It was found perpendicular magnetic anisotropy, which increases as temperature decreases. Values like squareness = 1 and coercivity = 1.45 kOe, at 10 K were obtained. Furthermore, the complete magneto-optical spectra of the films are recorded, showing a strong magneto-optical enhancement in the ultraviolet region at around 4.5 eV.