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

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

Mesoscale and Nanoscale Physics 2013-07-15 v2

Authors: Soo-hyon Phark , Jeison A. Fischer , Marco Corbetta , Dirk Sander , Jürgen Kirschner

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.

Keywords

spin-polarized scanning tunneling microscopy superparamagnetism Fe-coated W tips Co nanoislands differential conductance Langevin function magnetic response

Cite

@article{arxiv.1307.0591,
  title  = {Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy},
  author = {Soo-hyon Phark and Jeison A. Fischer and Marco Corbetta and Dirk Sander and Jürgen Kirschner},
  journal= {arXiv preprint arXiv:1307.0591},
  year   = {2013}
}

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

Abstract

Keywords

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