Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.17: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Optical properties of ultrathin magnetic layers on Cu(110) — •Richard Denk, Robert Mittermair, Michael Hohage, Lidong SUN, and Peter Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, A-4040 Linz, Austria

Magnetic thin films of Ni and Co on Cu(110)(2x1)O have been studied by means of Reflectance Difference Spectroscopy (RDS). The regular optical anisotropy signal has been used to monitor the morphology of the Co and Ni films during growth. In addition the magnetization of these films has been addressed by the RD-spectrometer via Magneto-Optical Kerr Effect (MOKE) measurements [1]. To perform the magnetic measurements the UHV chamber is equipped with an in-situ electromagnet. The present RD-MOKE setup allows conducting spectroscopic measurements of the magnetization of the films at photon energies between 1.5 eV and 5.5 eV. By applying the RD-technique at opposite magnetization (M⁺, M⁻) of the film, the optical anisotropy signal (Δr/r(M⁺) + Δr/r(M⁻))/2 can be separated from the MOKE signal (Δr/r(M⁺) - Δr/r(M⁻))/2. Hysteresis curves at any desired photon energy between 1.5 eV and 5.5 eV can be recorded online. For characterization of the film morphology, the chamber is equipped with a STM and a LEED/AES system. A major focus of the study has been the temperature dependence of the magnetization of Ni on the oxygen precovered Cu(110) surface, as well as the way how the remanent polar magnetization develops within the ultrathin Ni films. References [1] M. Wahl, Th. Herrmann, N. Esser, and W. Richter, phys. stat. sol. 0, 3002 (2003)