Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.28: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

Spin wave propagation in Ni₈₀Fe₂₀ antidot lattices — •Hans Bauer¹, Georg Woltersdorf¹, Sebastian Neusser², Dirk Grundler², and Christian Back¹ — ¹Universität Regensburg, 93043 Regensburg, Germany — ²Technische Universität München, 85747 Garching, Germany

Magnetic materials can be structured to form a two dimensional periodic antidot lattice. These artificial materials have properties different from the ones found in unpatterned thin films and open the door to the new field of magnonics, the magnetic analogon of photonics. We investigated a Ni₈₀Fe₂₀ antidot square lattice with a unit cell of 800 nm × 800 nm by time resolved Kerr microscopy. In our experiments the sample is excited by a coplanar wave guide at GHz frequencies and the spatial structure of the dynamic modes is observed at various bias field amplitudes and angles. Localized modes as well as extended modes are imaged with a spatial resolution of about 250 nm and are in good agreement with simulations performed on similar samples [1]. Finally, the spatio-temporal evolution of spinwave packets excited by nanosecond microwave bursts is imaged. The aim is to achieve field controlled propagation of spinwave pulses across the antidot lattice [2]. Part of the work was financially supported through the German Excellence Cluster "Nanosystems Initiative Munich".
S. Neusser et al., Appl. Phys. Lett. 93, 122501 (2008)
S. Neusser et al., Phys. Rev. B 78, 054406 (2008)