Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Magnetic Thin Films I
MA 17.1: Vortrag
Mittwoch, 25. März 2009, 10:15–10:30, HSZ 04
Magnetocrystalline anisotropy of strained FeCo alloys — •Stephan Schönecker, Carsten Neise, Manuel Richter, Klaus Koepernik, and Helmut Eschrig — IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
Tetragonally distorted Fe1−xCox alloys recently attracted interest due to their potential application as new media for high density recording, combining both a large uniaxial magnetocrystalline anisotropy (MAE) and a large saturation magnetisation for certain chemical composition x and tetragonal distortion. Volume relaxation was neglected in earlier calculations [1], which is however present at epitaxially grown layers and may alter the concluded magnetic properties of these alloys.
By considering the epitaxial Bain path, which provides a reasonable description of tetragonally distorted films on substrates (e.g. [2]), we investigated the influence of volume relaxation on the MAE and on the magnetic moment of Fe1−xCox alloys and on the ordered L10 phase (Fe0.5Co0.5). We employed density functional calculations in the implementation of the full potential local orbital program package FPLO [3]; disorder was described within the virtual crystal approximation.
[1] T. Burkert, L. Nordström, O. Eriksson, and O. Heinonen, Phys. Rev. Lett. 93, 027203 (2004)
[2] P. M. Marcus, F. Jona, and S. L. Qiu, Phys. Rev. B 66, 064111 (2002)
[3] K. Koepernik and H. Eschrig, Phys. Rev. B 59, 1743 (1999);
http://www.fplo.de