Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials I

MA 23.8: Talk

Thursday, March 29, 2007, 12:00–12:15, H22

Direct laser interference patterning of perpendicular Co/Pd multilayer films — •Philipp Leufke, Stephen Riedel, Paul Leiderer, Johannes Boneberg, and Manfred Albrecht — University of Konstanz, Department of Physics, D-78457 Konstanz, Germany

We report on direct laser interference patterning of Co/Pd multilayer films. The as-grown films show a high perpendicular magnetic anisotropy caused by interfacial effects. When exposed to nanosecond laser pulses the film stack will be annealed locally and as a consequence mixed chemically. This intermixing effect, in particular at the interfaces, will result in a reduction of magnetic anisotropy [1].

Multi-beam laser interference patterning is performend using two, three, and four beams of a Nd:YAG laser system at a wavelength of 532 nm. By altering the angle of incidence or polarization of the beams, different patterns of light intensity can be created [2]. The formed dot or stripe patterns are magnetically softer than the surrounding untreated film material affecting in particular the magnetic reversal mechanism. The latter is being investigated locally by magnetic force microscopy and compared to the hysteresis loops as measured by polar magneto-optical Kerr effect and superconductive quantum interference device magnetometry.

This project is funded by the DFG through SFB 513 and the Emmy Noether program at the University of Konstanz.

[1] C. Schuppler et al., Appl. Phys. Lett. 88, 012506 (2006).

[2] A. Aktag et al., J. Appl. Phys. 99, 093901 (2006).