Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.5: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P2
Spin-dependent scanning probe images of antiferromagnetic NiO(001) surfaces: A first-principles approach — •Mihail Granovskij, Andreas Schrön, and Friedhelm Bechstedt — Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
We present an accurate ab-initio description of the magnetic exchange force microscopy (MExFM). As a prototypical system the antiferromagnetic NiO(001) surface probed with a Fe tip is investigated.1
The tip-surface interaction is described on two levels. Short-range chemical and exchange forces between the tip apex and surface atoms are described in the framework of spin-polarized density functional theory (DFT) while long-range van-der-Waals forces are considered within a mesoscopic tip model. Exchange and correlation (XC) are treated within the local density approximation (LDA). For the Ni atoms in the NiO surface and the Fe atoms of the tip apex, an additional on-site Coulomb interaction U acting on the transition-metal 3d shells is included (LDA+U).
In order to understand the tip-surface interaction, we investigate the changes in the electronic structure of tip and surface versus distance. The resulting frequency shifts and MExFM images are presented and compared with recent experimental data.
1 M. Granovskij et al., Phys. Rev. B 88, 184416 (2013)