Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 5: Optische, metallische und magnetische Schichten

DS 5.3: Vortrag

Freitag, 4. März 2005, 11:15–11:30, TU HS110

RD-MOKE investigation of magnetic thin films — •R. Denk, R. Mittermair, M. Hohage, L.D. Sun, and P. Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, A-4040 Linz, Austria

Magnetic thin films of Ni, Co, and Fe on Cu(110) and Cu(110)(2x1)O have been studied by means of Reflectance Difference Spectroscopy (RDS). Besides the regular optical anisotropy signal, a RD-spectrometer can additionally address the magnetization of these films by measuring the rotation of the polarization due to the polar Magneto-Optical Kerr Effect (MOKE) [1]. To perform the magnetic measurements the UHV-chamber is equipped with an in-vacuum coil-magnet. This RD-MOKE setup allows conducting spectroscopic measurements of the magnetization of the films at transition energies between 1.5eV and 5.5 eV. By applying the RD-technique the optical anisotropy signal ((Δ r / r (M⁺) + Δ r / r (M⁻) /2) can be separated from the MOKE signal(Δ r / r (M⁺) − Δ r / r (M⁻)). Hysteresis curves at any desired energy between 1.5 eV and 5.5 eV may be obtained. The magnetic properties of films with substantially different film morphologies resulting from strongly variant growth conditions have been investigated. For characterization of the film morphology, the chamber is equipped with a STM and a LEED/AES system.

[1] M. Wahl, Th. Herrmann, N. Esser, and W. Richter, phys. stat. sol. 0, No. 8 3002 (2003)