Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 2: Magnetic Thin Films I
MA 2.2: Vortrag
Montag, 27. März 2006, 10:30–10:45, HSZ 03
Acquisition of optic and magneto-optic constants of Co/Pt films — •S. Fiedler1, H. Stillrich1, G. Neuber1, M. Linkerhand2, P. Pahl2, and H.P. Oepen1 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 2Universität Hamburg, 20355 Hamburg, Germany
Ultrathin Co layers on fcc Pt buffers showing (111) texture exhibit a strong perpendicular magnetic anisotropy. We have created Pt-Co-Pt layers on silicon substrates utilizing ECR-sputtering. For experimental investigation of the magnetic properties we use an ex situ MOKE experiment with He-Ne laser. We measure Kerr ellipticity and rotation quantitatively in longitudinal and polar geometry at an angle of incidence of 45 degrees as well as in polar geometry at 0 degree. We have investigated the magneto-optic properties of sandwiched single Co layers with fixed thickness and varying buffer or cap layer thickness. A strong dependence of the Kerr signals on cap as well as buffer layer thickness is found. The experimental results are simulated numerically [1] taking into account the intermixing Co/Pt. The dependence on cap layer thickness will be described in the framework of a simplified analytical expression for ultrathin films [2].
[1] J. Zak, E. R. Moog, C. Liu, and S.D. Bader, J. Magn. Magn. Mat. 89, 107 (1990)
[2] C.-Y. You and S.-C. Shin, phys. stat. sol. (b) 241, No. 7, 1406-1410 (2004)