Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.27: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Strong enhancement of magnetic anisotropy energy in alloyed nanowires — •Nikolay Negulyaev1, Larissa Niebergall1, Lucila Juárez Reyes2, Jesus Dorantes-Dávila3, Gustavo Pastor2, and Valeri Stepanyuk1 — 1Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany — 2Institut für Theoretische Physik, Universität Kassel, D-34132 Kassel, Germany — 3Instituto de Física, Universidad Autónoma de San Luis Potosí, 78000 San Luis Potosí, Mexico
One-dimensional atomic structures (monatomic wires and chains) are believed to be likely candidates for creation of nanostructures with large atomic orbital moments and hence with giant magnetic anisotropy energy (MAE) per atom [1,2]. We investigate the possibility of tuning the MAE of 3d transition metal monowires alloyed with 5d elements (Ir, Pt). Our ab initio studies give clear evidence that in mixed 3d-5d atomic wires MAE is one and even two orders of magnitude more than in pure wires constructed of the corresponding 5d [2] and 3d elements, respectively. Mechanisms responsible for the formation of such a strong MAE are revealed. The interplay between the structure of a monowire and its MAE is demonstrated. The contribution of both types of species (3d and 5d) into the MAE is discussed.
[1] J. Dorantes-Dávila and G. M. Pastor, Phys. Rev. Lett. 81, 208 (1998); Y. Mokrousov et al., Phys. Rev. Lett. 96, 147201 (2006).
[2] A. Smogunov, A. D. Corso, A. Delin, R. Weht, and E. Tosatti, Nat. Nanotechnol. 3, 22 (2008).