Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.52: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Structural and magnetic properties of thin CoCrPt-SiO₂ films and their application to patterned media — •Felix Springer¹, Christoph Brombacher², Hartmut Rohrmann³, Marco Sauer³, and Manfred Albrecht² — ¹University of Konstanz, Department of Physics, 78457 Konstanz, Germany — ²Chemnitz University of Technology, Institute of Physics, 09107 Chemnitz, Germany — ³OC Oerlikon Balzers AG, 9496 Balzers, Liechtenstein

Thin granular films of CoCrPt-SiO₂ are used as storage layer in perpendicular magnetic recording media. In order to investigate the properties of the storage layer only, we reduced the layer stack of a conventional hard disk to a system consisting of substrate/Ta/Ru/CoCrPt-SiO₂. We studied the properties of this system deposited under various growth conditions and observed a strong relationship between structural and magnetic properties. The formation of small grains in the hcp (0001) oriented Ru intermediate layer supported the formation of hcp (0001) oriented columnar CoPt grains in the magnetic layer. With increasing segregation of SiO₂ and Cr to the grain boundaries the exchange coupling between single CoPt grains was reduced and the coercivity increased. The application of those CoCrPt-SiO₂ films to patterned media might be a promising candidate to achieve areal densities of more than 1Tbit/in². Thus we deposited film systems onto arrays of SiO₂ nano spheres. Particles with diameter down to 10nm have been coated by reducing the overall film thickness and adjusting the deposition conditions of the different layers.