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MA: Fachverband Magnetismus

MA 26: Spin Dynamics / Spin Torque IV

MA 26.6: Vortrag

Donnerstag, 25. März 2010, 15:45–16:00, H10

Sub-wavelength non-diffractive spin-wave beams — Thomas Schneider¹, •Alexander A. Serga¹, Andrii V. Chumak¹, Christian W. Sandweg¹, Simon Trudel¹, Sandra Wolff², Mikhail P. Kostylev³, Vasil S. Tiberkevich⁴, Andrei N. Slavin⁴, and Burkard Hillebrands¹ — ¹FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²Nano + Bio Center, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — ³School of Physics, M013, University of Western Australia, Crawley, WA 6009, Australia — ⁴Department of Physics, Oakland University, Rochester, Michigan 48309, USA

We report on the investigation of linear sub-wavelength non-diffractive spin-wave beams in a 2D magnetic medium. These beams, are formed due to the anisotropy which is induced in the magnetic media by the bias magnetic field. Due to this anisotropy, it is possible, that spin waves have different oriented wave vectors but an identical direction of group velocity. A newly developed waveguide antenna allows the excitation of spin waves with the necessary wide angular wavevector spectrum. We investigated the dependence of the behaviour of the non-diffractive beams on the magnetic field and the antenna spectrum using space-, time- and phase-resolved Brillouin light scattering spectroscopy. It is shown that the sub-wavelength spin-wave beams propagate without noticeable broadening for more than 10 mm. The measurements demonstrate that the beam width is of the same order of magnitude as the wavelength. Results on the reflection and scattering of the beams are reported.