Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 29: Micro- and Nanostructured Magnetic Materials

MA 29.6: Vortrag

Mittwoch, 13. März 2013, 16:15–16:30, H23

Propagation of magnonic spin-wave modes in CoFeB waveguide — •Maria Mansurova, Benjamin Lenk, Stephan Shishkin, and Markus Münzenberg — I. Physikalisches Institut, Universität Göttingen, Germany

The understanding of guiding mechanisms of spin waves is highly important for the development of spin-wave logic gates. In this work, femtosecond laser pulses are used to optically excite (pump) and subsequently measure (probe) magnetization dynamics and spin wave propagation on a magnonic waveguide, which consists of a 16 μm wide defect line in a rectangular CoFeB antidot lattice, oriented either perpendicularly or at 45° to the bias magnetic field.

For each orientation of the magnetic field, spin wave spectra of the waveguide show the same modes as rectangular CoFeB antidot lattice, namely, Damon Eschbach (DE) surface mode, perpendicular spin standing wave (PSSW) and Kittel uniform precession (90° orientation only). These modes propagate both into the waveguide and continuous film, although DE mode is not normally present in the continuous CoFeB thin film spectra. Moreover, at 45° to the bias magnetic field orientation, the DE mode propagation length into the waveguide is larger compared to 90° orientation case.