Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Methods: other (experimental)

O 89.3: Vortrag

Donnerstag, 17. März 2011, 17:45–18:00, WIL B321

Surface stress and MOKE-measurements down to 30K — •Jörg Premper, Dirk Sander, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

A new combined stress and magneto-optical Kerr-effect (MOKE) experiment under UHV conditions has been developed. The temperature range of an optical 2-beam-stress measurement [1] and for MOKE experiments in the longitudinal and polar geometry in fields of up to 0.7 T has been extended down to 30 K. A liquid helium cooled cryostat is used which allows an accurate control of the sample temperature in the range 30 – 300 K. First results for surface stress and MOKE measurements were performed for H-adsorption and Co-growth on Pt(111), respectively. The low temperature of 30 K is applied to study for the first time the Xe-induced surface stress change on Pt(111), where a compressive stress of -2.5 N/m is observed after exposure of 10 L Xe. The results are discussed in view of previous work and new insights into inert gas induced surface stress changes.

[1] D. Sander, Zh. Tian, J. Kirschner: JPCM 21 (2009) 134015