Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Micro and Nanostructured Magnetic Materials I

MA 2.4: Talk

Monday, February 25, 2008, 11:00–11:15, EB 301

Co-Pt films and nanostructures by electrodeposition into diblock copolymer templates — •Manvendra Singh Khatri¹, Heike Schlörb¹, Sebastian Fähler¹, Ludwig Schultz¹, Bhanu Nandan², Marcus Böhme², Radim Krenek², and Manfred Stamm² — ¹IFW Dresden, P.O. Box 27 00 16, 01171 Dresden, Germany — ²IPF Dresden, Postfach 120 411, 01005 Dresden, Germany

Co-Pt and Fe-Pt alloys are favored materials for future magnetic data storage due to good hard magnetic properties like high coercivity and anisotropy. The Co-rich Co₈₀Pt₂₀ was chosen for this study because it does not require post annealing in contrast to the ordered L1₀ CoPt or FePt. The Co-Pt films have been deposited from an aqueous bath containing Pt-p-salt and Co sulphamate at different current densities. The influence of deposition current density on film properties was investigated. As an alternative to the porous alumina templates, diblock copolymer templates have been proposed that allow smaller feature sizes and thus yield to higher pore densities. Templates have been fabricated by dip-coating a conducting substrate into a solution of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and 2-(4-hydroxybenzeneazo) benzoic acid (HABA). Depending on the polymer composition lamellar or cylindrical structures can be achieved. By dissolving the HABA the pores are opened and afterwards electrodeposition of Co-Pt was carried out. Due to the inhomogeneous filling shape anisotropy parallel to the substrate surface is observed, whereas shape anisotropy along the wire axis (perpendicular to the surface) is expected for ideally filled Co-Pt nanowires.