Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.15: Poster
Dienstag, 1. April 2014, 13:00–15:30, P1
Modifying the spin-dependent electronic properties of a Co nanoisland by Fe decoration — •Vasilii A. Sevriuk1, Soo-hyon Phark1, Jeison A. Fischer1,2, Marco Corbetta1, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Laboratório de Filmes Finos e Superfícies, Departamento de Física, Universidade Federal de Santa Catarina , Florianópolis, SC, Brazil
We present a spin-polarized scanning tunneling spectroscopy (STS) study to characterize the effect of the circumferential decoration of a biatomic-layer-high (BLH) Co nanoisland, containing some 5000 atoms, by a BLH Fe stripe on the spin-dependent electronic properties. The spin-dependent differential conductance of a Fe-decorated Co island shows an almost constant state in the Co core. Our position-dependent STS data show a spatially uniform Co minority state around -0.3 eV. This finding is in sharp contrast to a sign-inverted spin-dependent differential conductance at the rim of a pure Co island. The constant energy value of the Co minority state deviates from the previously reported pronounced spatial variation of the peak energy on the nm scale for pure Co islands. We suggest that structural relaxations of the Co core of Fe-decorated Co islands are considerably reduced as compared to pure Co islands, and we discuss the implications for the modified spin-dependent electronic structure of the Fe-decorated Co cores.