Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.47: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Tailoring particle arrays by reactive ion etching: A novel method to realize percolated media — •Daniel Assmann1, Christoph Brombacher2, Marc Saitner3, Christian Pfahler3, Alfred Plettl3, Paul Ziemann3, Denys Makarov1, Martin Siekman4, Leon Abelmann4, Hartmut Rohrmann5, and Manfred Albrecht2 — 1Universitaet Konstanz — 2Technische Universitaet Chemnitz — 3Universitaet Ulm — 4University of Twente, Enschede, The Netherlands — 5OC Oerlikon, Balzers, Liechtenstein
Percolated perpendicular media (PPM) is a possible way to increase the storage density in magnetic hard discs by pushing the limit of superparamagnetism, so that the 1Tbit/in2-regime can be reached.
We present an approach to the realization of a PPM by generating arrays of sparsely distributed polystyrene (PS) nanospheres with adjustable diameters and periodicity as a template for the deposition of Co/Pt multilayers with perpendicular magnetic anisotropy.
The generation of the particle arrays is done by self assembled monolayers of particles which are isotropically plasma etched to reduce the size of the particles. After depostion of Co/Pt multilayers onto these patterns they form an exchange decoupled, single-domain magnetic nanostructure array surrounded by a continuous film.
The magnetic reversal characteristic of the film-particle system is dominated by domain nucleation and domain wall pinning at the particle locations creating a percolated perpendicular media system, which we illustrated by MFM imaging and MOKE hysteresis loops.