Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.92: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Interference of coherent spin waves in Ni₈₁Fe₁₉ microstripes — •Thomas Brächer, Philipp Pirro, Björn Obry, Helmut Schultheiss, Peter Andreas Beck, Britta Leven, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Propagating spin waves have attracted increasing interest during the past years due to their potential use in signal processing and in logical devices. The propagation in metallic ferromagnets like Ni₈₁Fe₁₉ is of particular interest because these materials offer the ability of microstructuring with industrial standard processes.

We report on the observation of interference of spin waves and their coherent propagation in Ni₈₁Fe₁₉ microstripes by using space- and phase-resolved Brillouin light scattering microscopy (µBLS). By employing these techniques, we observe stationary interference patterns formed by counterpropagating spin-wave beams and the emerging phase profile. The spin waves are excited by two phase-locked microwave antennas on top of the Ni₈₁Fe₁₉ stripes.

The observed intensity and phase distributions along the stripe can be reconstructed with a simple model of interfering plane waves with sinusoidal transverse profiles. In addition, we were able to map a wide part of the spin-wave dispersion by extracting the spin-wave wavelength out of the interference patterns.

Financial support by the DFG, by the Carl-Zeiss-Stiftung, the Graduiertenkolleg 792 and Graduate School of Excellence "MAterials Science IN MainZ" is gratefully acknowledged.