Dresden 2006 – scientific programme
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MA: Magnetismus
MA 8: Surface Magnetism
MA 8.5: Talk
Monday, March 27, 2006, 16:00–16:15, HSZ 103
Magnetization reorientation in Au/Co: in-situ prepared ultra-thin films — •D. Arvanitis1, C. Andersson1, T. Konishi2, E. Holub-Krappe3, O. Karis1, and H. Maletta3 — 1Department of Physics, Uppsala University, Uppsala, Sweden — 2Department of Chemistry, Chiba University, Inage, Chiba, Japan — 3Hahn-Meitner-Institut, Berlin, Germany
We present X-ray Magnetic Circular Dichoism (XMCD) results to characterize the Spin Reorientation Transition (SRT) in ultra-thin in-situ prepared epitaxial Au/Co sandwich structures. The samples are prepared on an epitaxial Au(111) layer grown in-situ on a W(110) single crystal. We have investigated modifications in magnetic properties induced both by varying the Co film thickness (2-4 atomic layers) and thickness of the Au cap (0 to 5 atomic layers). For our in-situ samples, the SRT upon Au capping, at 300K, takes place around 4 atomic layers in contrast to related samples prepared ex-situ [1]. We present a novel phase diagram for the SRT for our in-situ grown films. An in-plane easy direction is observed for the whole investigated thickness range for the in-situ prepared Co films without cap, in contrast to work on in-situ Co/Au(111) [2]. Around 4 atomic layers Co, the addition of a small amount of a Au cap induces the system to exhibit a stable remanence both with an in-plane and an out-of-plane easy direction.
[1] R. Sellmann, H. Fritzsche, H. Maletta et al. Phys. Rev. B 64, 054418/1 (2001)
[2] R. Allenspach, M. Stampanoni, A. Bischof, Phys. Rev. Lett. 65, 3344 (1990)