Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 72.10: Talk

Thursday, March 29, 2012, 17:45–18:00, BH 243

Interplay between magnetic anisotropy and quantum-well states in thin magnetic films — •Tamene Dasa, Pavel Ignatiev, and Valeriy Stepanyuk — Max-Planck-Institut für Mikrostrukturphysik Weinberg 2, D-06120 Halle, Germany

In this work the magnetic properties of thin magnetic films on non magnetic substrate have been investigated. The main focus is on the interplay between the magnetic anisotropy (MA) and the spin-polarized qauntum-well states arising in such films. The study is performed in the framework of the Density Functional Theory (DFT) by means of the VASP code and the LSDA for the exchange-correlation. We consider Co and Fe films, with vertical size varying from 1 to 6 monolayers, on Pt(001) surface. The Pt substrate is expected to provide high MA.[1] Our results demonstrate that the magnetic anisotropy energy (MAE) and the easy axis direction can be altered by changing the thickness of the film. This effect is explained in terms of the spin-polarized quantum-well states within the film. We also show the possibility to tune the MAE by means of capping the magnetic film by non-magnetic material.

[1] P. Gambardella, S. Rusponi, M. Veronese, S. S Dhesi, C. Grazioli, A. Dallmeyer, I. Cabiria, R. Zeller, P. H. Dederichs, K. Kern, C. Carbone, and H. Brune, Science 300, 1130 (2003).

[2] M. Tsujikawa, A. Hosokaw and Tatsuki Oda, Phys. Rev. B 77, 054413 (2008).