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MA: Fachverband Magnetismus

MA 36: Micro- and Nanostructured Magnetic Materials III

MA 36.6: Talk

Wednesday, March 16, 2011, 16:00–16:15, HSZ 103

FePtCu films on SiO₂ spherical particle arrays — •Fabian Ganss, Christoph Brombacher, Beate Mainz, Michael Hietschold, and Manfred Albrecht — Chemnitz University of Technology, Institute of Physics, Germany

Following the concept of bit patterned media for data storage application [1], FePt/Cu bilayers were sputter deposited at room temperature onto hexagonal close packed arrays of spherical silica particles with a diameter of 100 nm. Rapid thermal annealing at various temperatures was performed to transform the bilayers into an (Fe₅₂Pt₄₈)₈₆Cu₁₄ alloy with perpendicular magnetic anisotropy [2,3] and to achieve decoupled film caps on top of the particles by dewetting, thus forming hard magnetic nanostructures. The dewetting behaviour of the film in dependence on the annealing temperature was studied by SEM and cross-section TEM. Hysteresis loops measured by SQUID magnetometry reveal an increasing perpendicular anisotropy at higher annealing temperatures and a coercivity of almost 2 T. The magnetic characterization was complemented by MFM at different remanent states, showing the magnetic decoupling between the caps. Points of a remanence curve were extracted from the MFM images and are compared to SQUID measurements.

[1] B. D. Terris, J. Magn. Magn. Mater. 321, 512 (2009)

[2] M. L. Yan et al., J. Appl. Phys. 99, 08G903 (2006)

[3] D. Makarov et al., Appl. Phys. Lett. 96, 062501 (2010)