Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Surface Magnetism II

MA 9.1: Vortrag

Montag, 23. März 2009, 15:15–15:30, HSZ 403

Correlation between structural, electronic and magnetic properties on nm-small Co islands — •Hirofumi Oka, Guillemin Rodary, Sebastian Wedekind, Dirk Sander, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany

We used spin-polarized low-temperature scanning tunneling microscopy and spectroscopy in field to study the correlation between local magnetic and electronic properties within single Co nano-islands. Differential conductance (dI/dV) hysteresis loops, which we produce by plotting the dI/dV signal while changing the external magnetic field [1], are analyzed. We measured spatially-resolved hysteresis loops as a function of position on single Co islands. Co islands grown on Cu(111) clearly show spin-polarized d_z² resonant states around the center of the island.[2] Strain-induced structural relaxations in the islands affect the energy position of the states close to the edge of the island.[3] Clear ferromagnetic dI/dV hysteresis loops were observed within the area where the Co island show the resonant states. Just around the edge, the resonant states are strongly diminished in intensity and “rim states” [4] develop. We present dI/dV hysteresis loops measured close to the island edge and discuss the results, also in view of recent work [4].

[1] G. Rodary, S. Wedekind, D. Sander, and J. Kirschner, JJAP (in press). [2] L.Diekhöner et al., PRL 90, 236801 (2003). [3] M. V. Rastei et al., PRL 99, 246102 (2007). [4] O. Pietzsch et al., PRL 96, 237203 (2006).