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MA: Fachverband Magnetismus

MA 3: Micro- and nanostructured Materials

MA 3.5: Talk

Monday, March 7, 2016, 10:45–11:00, H32

High Amplitude Ferromagnetic Resonance in Sub-Micron Disks — •Markus Haertinger¹, Hans G. Bauer¹, Martin Decker¹, Chen Luo^1,2, Torsten Kachel², Georg Woltersdorf^1,3, and Christian H. Back¹ — ¹Department of Physics, Universität Regensburg, 93040 Regensburg, Germany — ²Helmholtz-Zentrum Berlin, 12489 Berlin, Germany — ³Department of Physics, Martin-Luther-Universität Halle, 06099 Halle(Saale), Germany

We investigate the modified linear and nonlinear response of the magnetization in confined magnetic elements. For this purpose we structured some Py disks on top of a coplanar waveguide. The size of the disks was varied between 300 and 800 nm for the diameter and between 20 and 40 nm for the thickness of the disks. In our experiments we use time resolved X-ray magnetic circular dichroism (XMCD) experiments to determine the excursion angle during the ferromagnetic resonance (FMR) experiments[1]. Additionally we can compare our experimental date with the results of micromagnetic simulations.

Our experiments provide us with the excitation dependence of the excursion angle of the precessing magnetization. For some of the larger disks we are able to resolve the transition from linear to the nonlinear regime. We found a reduction of the excursion angle for similar excitation field and decreased element dimensions.

[1] H.G. Bauer et al. Nature Commun. 6, 8274 (2015)