Theoretical study of the role of the tip in enhancing the sensitivity of differential conductance tunneling spectroscopy on magnetic surfaces

K. Palotás, Werner A. Hofer, L. Szunyogh

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Based on a simple model for spin-polarized scanning tunneling spectroscopy (SP-STS), we study how tip magnetization and electronic structure affects the differential conductance (dI/dV) tunneling spectrum of an Fe(001) surface. We take into account energy dependence of the vacuum decay of electron states and tip electronic structure either using an ideal model or based on ab initio electronic structure calculation. In the STS approach, topographic and magnetic contributions to dI/dV can clearly be distinguished and analyzed separately. Our results suggest that the sensitivity of STS on a magnetic sample can be tuned and even enhanced by choosing the appropriate magnetic tip and bias set point, and the effect is governed by the effective spin polarization.

Original languageEnglish
Article number214410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number21
DOIs
Publication statusPublished - Jun 10 2011

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Electronic structure
space transportation system
Spectroscopy
electronic structure
sensitivity
spectroscopy
Spin polarization
electron states
Electron energy levels
Magnetization
Vacuum
Scanning
magnetization
vacuum
scanning
decay
polarization
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "Based on a simple model for spin-polarized scanning tunneling spectroscopy (SP-STS), we study how tip magnetization and electronic structure affects the differential conductance (dI/dV) tunneling spectrum of an Fe(001) surface. We take into account energy dependence of the vacuum decay of electron states and tip electronic structure either using an ideal model or based on ab initio electronic structure calculation. In the STS approach, topographic and magnetic contributions to dI/dV can clearly be distinguished and analyzed separately. Our results suggest that the sensitivity of STS on a magnetic sample can be tuned and even enhanced by choosing the appropriate magnetic tip and bias set point, and the effect is governed by the effective spin polarization.",
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AB - Based on a simple model for spin-polarized scanning tunneling spectroscopy (SP-STS), we study how tip magnetization and electronic structure affects the differential conductance (dI/dV) tunneling spectrum of an Fe(001) surface. We take into account energy dependence of the vacuum decay of electron states and tip electronic structure either using an ideal model or based on ab initio electronic structure calculation. In the STS approach, topographic and magnetic contributions to dI/dV can clearly be distinguished and analyzed separately. Our results suggest that the sensitivity of STS on a magnetic sample can be tuned and even enhanced by choosing the appropriate magnetic tip and bias set point, and the effect is governed by the effective spin polarization.

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