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O: Oberflächenphysik

O 18: Nanostructures II

O 18.7: Vortrag

Dienstag, 28. März 2006, 12:45–13:00, PHY C213

Nanostructuring of NiMnSb(110): influences on surface magnetic properties — •Christian Eickhoff^1,2, Hristo Kolev¹, Georgi Rangelov¹, Lifeng Chi¹, and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — ²now at: Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin, Germany

The magnetic and electronic properties, crystal structure and surface morphology at the (110) surface of the ferromagnetic half-Heusler alloy NiMnSb have been investigated by means of magneto-optical Kerr effect, appearance potential spectroscopy, low-energy electron diffraction and atomic-force microscopy.

A standard sputter-anneal preparation procedure leads to a stoichiometric surface which is predicted to show a high spin polarisation at the Fermi level. We observed, in contrast, a reduced surface magnetic signal. Atomic-force microscopy reveals a nanostructuring of the NiMnSb surface which proceeds with the number of preparations. The changed morphology of the NiMnSb surface is made responsible for the observed reduced surface magnetization [1].

[1] H. Kolev, G. Rangelov, J. Braun, and M. Donath: Reduced surface magnetization of NiMnSb(001), Phys. Rev. B 72, 104415 (2005)