This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/28/49/496002 in citations.
Giant perpendicular magnetic anisotropy energies in CoPt thin films: impact of reduced dimensionality and imperfections
Giant perpendicular magnetic anisotropy energies in CoPt thin films: impact of reduced dimensionality and imperfections
The impact of reduced dimensionality on the magnetic properties of the tetragonal L10 CoPt alloy is investigated from ab initio considering several kinds of surface defects. By exploring the dependence of the magnetocrystalline anisotropy energy (MAE) on the thickness of CoPt thin films, we demonstr...
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Personal Name(s): | Brahimi, Samy (Corresponding author) |
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Bouzar, Hamid / Lounis, Samir | |
Contributing Institute: |
JARA-FIT; JARA-FIT JARA - HPC; JARA-HPC Quanten-Theorie der Materialien; PGI-1 Quanten-Theorie der Materialien; IAS-1 |
Published in: | Journal of physics / Condensed matter, 28 (2016) 49, S. 496002 |
Imprint: |
Bristol
IOP Publ.
2016
|
DOI: |
10.1088/0953-8984/28/49/496002 |
Document Type: |
Journal Article |
Research Program: |
Controlling Configuration-Based Phenomena Controlling Spin-Based Phenomena |
Publikationsportal JuSER |
The impact of reduced dimensionality on the magnetic properties of the tetragonal L10 CoPt alloy is investigated from ab initio considering several kinds of surface defects. By exploring the dependence of the magnetocrystalline anisotropy energy (MAE) on the thickness of CoPt thin films, we demonstrate the crucial role of the chemical nature of the surface. For instance, Pt-terminated thin films exhibit huge MAEs which can be 1000% larger than those of Co-terminated films. Besides the perfect thin films, we scrutinize the effect of defective surfaces such as stacking faults or anti-sites on the surface layers. Both types of defects reduce considerably the MAE with respect to the one obtained for Pt-terminated thin films. A detailed analysis of the electronic structure of the thin films is provided with a careful comparison to the CoPt bulk case. The behavior of the MAEs is then related to the location of the different virtual bound states utilizing second order perturbation theory. |