Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: [MA] Joint Session "Surface Magnetism III" (jointly with O)

O 72.2: Vortrag

Donnerstag, 29. März 2012, 15:30–15:45, BH 243

High resolution electron energy loss spectroscopic studies of surface spin waves in ultrathin Co films on Cu(001) — •Rajeswari Jayaraman¹, Harald Ibach¹, Antonio Toninho Costa², and Claus Michael Schneider¹ — ¹Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany — ²Departamento de Ciências Exatas, Universidade Federal de Lavras, 37200-000 Lavras, Minas Gerais, Brazil

Electron energy loss spectroscopy has become a valuable tool for studies of the dispersion of spin waves at ferromagnetic surfaces. Using our recently developed high resolution spectrometer [1] we have extended a previous study [2] of the surface spin waves of fcc cobalt films deposited on Cu(001) along the [011] direction to lower wave vectors k_∥ and lower spin wave energies. Spin waves are resolved down to k_∥=0.2 Å⁻¹ and spin wave energies of 15meV. For k_∥=0.2−0.35 Å⁻¹ spectra with resolution of 7meV exhibit a noticeable contribution of bulk spin waves, in agreement with theoretical calculations. We have furthermore studied the dispersion along the [001] direction. In agreement with theory [3] we find that the spin wave dispersion is nearly isotropic in this system even at higher wave vectors.

[1] H. Ibach et al., to be published.

[2] R. Vollmer et al., Phys. Rev. Lett. 91, 147201 (2003).

[3] A.T. Costa et al., Phys. Rev. B 69, 64413 (2004); A.T. Costa et al., Phys. Rev. B 70, 054406 (2004).