Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Micromagnetism/Computational Magnetics
MA 7.6: Vortrag
Montag, 26. März 2007, 18:15–18:30, H10
Ferromagnetic resonance in ordered magnetic particle systems — •Peter Majchrák1,3, Zdeněk Frait2, Ján Dérer1, Eva Kováčová1, Vasil Šmatko1, and Ivo Vávra1 — 1Institute of Electrical Engineering SAS, Bratislava, Slovakia — 2Institute of Physics, AS CR, Na Slovance 2, Prague Czech Republic — 3on leave at Institute of Physics, AS CR, Na Slovance 2, Prague Czech Republic
Microwave properties of arrays of circular FeSi dots were studied by ferromagnetic resonance (FMR) technique in wide range of frequencies from 17GHz to 70GHz. All of the dots had the radius 2 - 3 μm, thickness 40 nm, and were arranged into square array with 4 μm dot period. In the case of perpendicular magnetization (in field up to 28 kG) multiple resonance peaks were observed below the main FMR peak. Quantitative description of the observed multiresonance FMR spectra is given using the dipolar intradot interactions, and also the inhomogeneity of the intradot static demagnetization field in the nonellipsoidal dot is taken into account. In the next part of the contribution there are presented the results of FMR measurements performed on the superlattice of iron nanoparticle layers.