Regensburg 2016 – wissenschaftliches Programm
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MI: Fachverband Mikrosonden
MI 7: Poster: Microanalysis and Microscopy
MI 7.10: Poster
Mittwoch, 9. März 2016, 18:00–20:00, Poster E
Characterization of a UHV evaporator for the coating of W-tips for room-temperature SP-STM — •Kai Besocke, Hendrik Bettermann, and Mathias Getzlaff — Institute of Applied Physics, University Düsseldorf
Our research involves supported nanoparticles of 3d-metal alloys. Magnetic and electronic properties and temperature dependent behavior are interesting for fundamental research and possible technological applications. These properties depend strongly on the nanoparticles’ size.
A possible approach to measure the magnetic properties and their magnetic interaction on different substrates with spatial resolution is spin-polarized scanning tunneling microscopy (SP-STM).
We focus on the in-situ coating of non-magnetic W-tips with a layer of Fe since this system is known to have an intrinsic in-plane magnetization and hence doesn’t need external magnetic fields.
Self-etched and commercially available tips are used. Effects of heating on the Fe-layer that was prepared by rod and/or crucible evaporation were investigated. The MircoSPM by Omicron is operating at room temperature at a base pressure below 2· 10−10mbar.
Examination of prepared tips is focused on scanning tunneling spectroscopy (SPS). Ex-situ (Off-site) scanning electron microscopy (SEM) is also availabe.