Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Magnetic Thin Films II

MA 23.6: Talk

Wednesday, March 25, 2009, 16:00–16:15, HSZ 04

Tuning Coercivity in CoCrPt-SiO₂ Hard Disk Material — •Thomas Strache¹, Stefan Tibus^2,3, Felix Springer², Hartmut Rohrmann⁴, Manfred Albrecht³, Kilian Lenz¹, and Jürgen Fassbender¹ — ¹Forschungszentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 51 01 19, 01314 Dresden, Germany — ²University of Konstanz, Department of Physics, 78457 Konstanz, Germany — ³Chemnitz University of Technology, Institute of Physics, 09107 Chemnitz, Germany — ⁴OC Oerlikon Balzers, AG Data Storage, P.O. Box 1000, 9496 Balzers, Liechtenstein

In order to increase the storage density of modern computer disk drives and to push the superparamagnetic limit to the smallest achievable bit sizes further, smaller grains with even larger magnetic anisotropies are required, which are accompanied by large coercive fields obstructing the writing process. One route to overcome this problem is to independently reduce the coercive field without altering anisotropy and remanence by tailoring the intergranular exchange in granular CoCrPt-SiO₂ films.

Here we demonstrate that by means of ion implantation of Co and Ne a continuous reduction of the coercive field can be achieved without significant modification of the remaining magnetic parameters. In addition to the magnetization reversal behavior of the entire film investigated by magneto-optic Kerr effect and SQUID magnetometry, also the magnetic domain configuration in the demagnetized state is imaged by magnetic force microscopy.