Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 9: Magnetic Materials I
MA 9.8: Talk
Monday, March 14, 2011, 16:30–16:45, HSZ 401
Evaluation of magnetic anisotropy energy in a relativistic picture — •Toshio Miyamachi1, Tobias Schuh1, Shih-Yu Wu2, Chein-Cheing Kuo2, and Wulf Wulfhekel1 — 1Physikalisches Institut, Karlsruher Institut für Technologie, Germany — 2Department of Physics, National Sun Yat-sen University, Taiwan
The magnetic stability of nanostructures is relied on the magnetic anisotropy energy (MAE). The MAEs of small clusters are experimentally evaluated with two different models. Firstly, the effective spin model is used for inelastic tunneling spectroscopy (ITS) [1]. In this model, only an effective spin S is treated. Secondly, the Bruno model is used for X-ray magnetic circular dichroism (XMCD), where the MAE is linked to an anisotropy of the orbital momentum L [2]. To bring these models together, we propose a relativistic model with the total angular momentum J = L + S. Within our relativistic model, the MAE of a Co single atom on Pt(111) obtained with ITS [3] is reevaluated as 13.7 meV/atom. The validity of our model is verified by comparing calculated magnetization curves with experimental ones obtained by XMCD and spin-polarized scanning tunneling microscopy [4,5].
[1] C. F. Hirjibehedin et al., Science 317, 1199 (2007)
[2] P. Pruno, Phys. Rev. B 39, 865 (1989)
[3] T. Balashov et al., Phys. Rev. Lett. 102, 257203 (2009)
[4] P. Gambardella et al., Science 300, 1130 (2003)
[5] F. Meier et al., Science 320, 82 (2008)