Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Magnetic Clusters
MA 2.6: Vortrag
Montag, 31. März 2014, 10:45–11:00, HSZ 401
Tuning the magnetic anisotropy of a single nanostructure by perimetric decoration — •Marco Corbetta1, Soo-hyon Phark1, Jeison Antonio Fischer1,2, Safia Ouazi1, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany — 2Laboratório de Filmes Finos e Superfícies, Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
We investigate individual Fe-decorated bilayer high Co islands on Cu(111) by spin-polarized STM in magnetic fields. Fe decorates the Co core by a few nm wide bilayer rim. This decoration induces larger switching fields Hsw of the Co cores as compared to those of pure Co islands of the same size [1,2]. The quantitative analysis of the island size dependence of the switching field reveals that all Co atoms of the Co core contribute to the magnetic anisotropy with an average value of 0.115 meV/atom. This is 22% less than we previously reported for pure Co islands [2]. On the basis of spatially resolved measurements of the differential conductance, we ascribe this change of magnetic anisotropy to the modification of the electronic and atomic structure of the Co core due to Fe-decoration. Our spectroscopy data indicate that structural relaxations of the Co core of Fe-decorated Co islands are negligible as compared to pure Co islands, and this might be an important aspect to understand the reduced magnetic anisotropy. The Fe rim does not show a net magnetic moment, as checked by SP-STM in magnetic fields. [1] H. Oka et al., Science 327, 843 (2010). [2] S. Ouazi et al. Phys. Rev. Lett. 108, 107206 (2012).