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arXiv · 1307.0591

Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy

Soo-hyon Phark·Jeison A. Fischer·Marco Corbetta·Dirk Sander·Jürgen Kirschner
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Abstract

We performed spin-polarized scanning tunneling spectroscopy on biatomic-layer-high Co nanoislands grown on Cu(111) in magnetic fields oriented normal to the sample surface, with Fe-coated W tips. Increasing the temperature from 10 to 30 K, we observe a reduced slope of the differential conductance around zero field. A quantitative analysis of the field- and temperature-dependent differential conductance data in the framework of superparamagnetism as described by a Langevin function gives an excellent description of the experimental results. The analysis suggests that a Fe nano-apex at the W tip, which is composed of 220-300 Fe atoms, determines the magnetic response of the tip.

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Soo-hyon Phark, Jeison A. Fischer, Marco Corbetta, Dirk Sander, Jürgen Kirschner. 2013-07-12. Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy. https://arxiv.org/abs/1307.0591

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