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

Soohyon Phark | Zendy; Jeison A. Fischer | Zendy; Marco Corbetta | Zendy; D. Sander | Zendy; J. Kirschner | Zendy

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

Author(s) -

Soohyon Phark,

Jeison A. Fischer,

Marco Corbetta,

D. Sander,

J. Kirschner

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4815993

Subject(s) - superparamagnetism , scanning tunneling microscope , condensed matter physics , spin polarized scanning tunneling microscopy , materials science , scanning tunneling spectroscopy , conductance , brillouin and langevin functions , magnetic field , quantum tunnelling , spin (aerodynamics) , spectroscopy , analytical chemistry (journal) , nuclear magnetic resonance , nanotechnology , magnetization , chemistry , physics , quantum mechanics , chromatography , thermodynamics

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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