Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.22: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Dominant role of thermal magnon excitation in the temperature dependence of interlayer exchange coupling — •Kilian Lenz, Sangita S. Kalarickal, Xiaoying Xu, Klaus Baberschke, and Wolfgang Kuch — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Ultrathin Ni/Cu/Co trilayers were deposited on Cu(001) in ultrahigh vacuum (UHV) and the ferromagnetic resonance (FMR) measured in situ as a function of both, temperature and out-of-plane angle of the external field. The interlayer exchange coupling Jinter can then be unambiguously extracted at various temperatures, entirely from the angular dependence of the resonance field positions [1]. The temperature dependence of Jinter(T) was found to follow an effective power law ATn, n≈1.5. Analysis of the scaling parameter A shows an oscillatory behavior with spacer thickness, as does the strength of the coupling at T=0. The results clearly indicate that the dominant contribution to Jinter(T) is due to the excitation of thermal spin waves and that it follows closely recently developed theory [2].
[1] S.S. Kalarickal, X.Y. Xu, K. Lenz, W. Kuch, and K. Baberschke, Phys. Rev. B 75, 224429 (2007).
[2] S. Schwieger, J. Kienert, K. Lenz, J. Lindner, K. Baberschke, and W. Nolting, Phys. Rev. Lett. 98, 057205 (2007).