| Autor: |
Kuanr, B. K., Buchmeier, M., Gareev, R. R., Bürgler, D. E., Schreiber, R., Grünberg, P. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 3/15/2003, Vol. 93 Issue 6, p3427, 8p, 7 Graphs |
| Abstrakt: |
We report on the spin-wave excitation frequencies and the broadening of the mode linewidths in Stokes and anti-Stokes Brillouin light scattering spectra of strongly exchange coupled (2-6.5 mJ/m²), epitaxial trilayers with the following structures: Fe(80 Å)/Si wedge/Fe(100 Å) and Fe(50 Å)/Al wedge/Fe(70 Å). Both spacer materials yield qualitatively similar spectra which evolve in the same way when the spacer thickness increases. We determine the type of interlayer coupling and quantify its strength as a function of the spacer thickness by comparing and fitting the mode positions to a model calculation. Furthermore, we observe clearly different behaviors of the mode linewidths as a function of spacer thickness for the optic and acoustic modes. There are also strong differences between the Stokes and anti-Stokes side of the spectra. The largest linewidths of up to 8 GHz occur at spacer thicknesses between 5 and 8 Å for both spacer materials. Lateral averaging and two-magnon scattering are qualitatively discussed as possible sources for the line-broadening. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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