Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Magnetic Thin Films I
MA 46.10: Vortrag
Donnerstag, 19. März 2015, 17:30–17:45, H 1012
Non bulk-like magnetoelastic coupling in Fe monolayers on Ag (001) — •Kenia Novakoski Fischer, Dirk Sander, and Jürgen Kirschner — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle
Film strain contributes significantly to the magnetic anisotropy of atomic layers via the magnetoelastic coupling Bi [1]. The magnetoelastic coupling coefficient B1 is experimentally accessible from measurements of the magnetoelastic stress change upon a magnetization reorientation along the <100> film directions. We present results of magnetoelastic stress measurements of 30 layers of Fe on Ag (001). We find that a reduced growth temperature of 150 K as compared to 300 K influences both epitaxial film stress and magnetoelastic stress. For growth at 300 K we find B1= +25 MJ/m3 and for growth at 150 K B1=+3.8 MJ/m3. This differs in sign and magnitude from the respective bulk value B1bulk=−3.4 MJ/m3. This result in conjunction with previous studies [2,3] indicates that intermixing at the Fe-Ag interface needs to be considered for growth at 300 K. Our results shed fresh light on the role of lattice strain and intermixing on the resulting magnetoelastic coupling.
[1] D. Sander, Rep. Prog. Phys. 62 (1999) 809. [2] R.J. Hicken, S.J. Gray, A. Ercole, C. Daboo, D.J. Freeland, E. Gu, E. Ahmad, J.A.C. Bland, Phys. Rev. B 55 (1997) 5898. [3] M. Canepa, P. Cantini, O. Ricciardi, S. Terreni, and L. Mattera, Surface Science 429 (1999) 34.