Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: [MA] Surface magnetism IV

O 81.1: Vortrag

Donnerstag, 17. März 2011, 15:15–15:30, HSZ 103

SP-STM study on bulk nickel (111) surface — •Liudmila Dzemiantsova, André Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg

It has been recently reported that ferromagnetic materials, in particular nickel, can be used as ideal substrates for a high quality graphene formation [1, 2]. Despite the fact that nickel is a good source of spinpolarized electrons, there remains a lack of information about spinpolarized scanning tunneling microscopy (SP-STM) investigations of its surfaces [3, 4].

In our study we used SP-STM to explore the domain structure of a bulk nickel crystal (111) surface on a large scale. We showed that domains can easily be shifted at low magnetic fields or by the stray field of the magnetically coated tip. The strongest magnetic signal was achieved at energies below the Fermi level. This result is in contrast to previous theoretical expectations [3].

[1] A. Varykhalov et al., Phys. Rev. B., 80, 035437 (2009)

[2] Yu.S. Dedkov et al., App. Phys. Lett., 92, 052506 (2008)

[3] K-F. Braun et al., Phys. Rev. B, 77, 245429 (2008)

[4] Y. Nishimura et al., Phys. Rev. B, 79, 245402 (2009)