Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 28: Spindynamik / Ummagnetisierungsvorg
änge
MA 28.12: Vortrag
Donnerstag, 11. März 2004, 18:00–18:15, H23
Evidence of spin-pumping effect in the FMR of coupled trilayers — •T. Toliński1,2, K. Lenz1, J. Lindner1,3, E. Kosubek1, and K. Baberschke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Permanent address: Institute of Molecular Physics, PAS, Smoluchowskiego 17, 60-179 Poznań, Poland — 3New address: Institut für Physik, Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany
The spin dynamics between two ultrathin ferromagnetic layers (Ni, Co) exchange coupled via a nonmagnetic Cu spacer of a few monolayers is studied using in situ ferromagnetic resonance. The angular and the temperature dependence of the linewidth shows pronounced changes that can be understood assuming the presence of an additional Gilbert damping resulting from a spin-current pumped through the interface between the ferromagnetic and nonmagnetic layers and by considering the dynamical part of the interlayer exchange coupling. In contrast to investigations on Fe films decoupled by thick Au spacers [1] the effect of the interlayer exchange coupling on this phenomenon is presented here. The competition between the Gilbert damping inherent in the ferromagnetic film and the Gilbert damping developed by the interface leads to an irregular behavior of the temperature dependence of the resonance linewidth for both the in-phase and out-of-phase precessing modes. It is shown that the oscillatory nature of the coupling is also revealed in the dependence of the resonance linewidth Δ H on the spacer thickness. Supported by the DFG (Sfb 290, TP A2).
[1] B. Heinrich et al., Phys. Rev. Lett. 90, 187601 (2003).