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arXiv · 1208.5383

Photo-magnonics

Benjamin Lenk·Fabian Garbs·Henning Ulrichs·Nils Abeling·Markus Münzenberg
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Abstract

In the framework of magnonics all-optical femtosecond laser experiments are used to study spin waves and their relaxation paths. Magnonic crystal structures based on antidots allow the control over the spin-wave modes. In these two-dimensional magnetic metamaterials with periodicities in the wave-length range of dipolar spin waves the spin-wave bands and dispersion are modified. Hence, a specific selection of spin-wave modes excited by laser pulses is possible. Different to photonics, the modes depend strongly on the strength of the magneto-static potential at around each antidot site - the dipolar field. While this may lead to a mode localization, also for filling fractions around or below 10%, Bloch states are found in low damping ferromagnetic metals. In this chapter, an overview of these mechanisms is given and the connection to spin-wave band spectra calculated from an analytical model is established. Namely, the plane-wave method yields flattened bands as well as band gaps at the antidot lattice Brillouin zone boundary.

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Benjamin Lenk, Fabian Garbs, Henning Ulrichs, Nils Abeling, Markus Münzenberg. 2012-08-27. Photo-magnonics. https://doi.org/10.1007/978-3-642-30247-3_6

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