New insights into nanomagnetism: Spin-polarized scanning tunneling microscopy and spectroscopy studies

Hirofumi Oka, Guillemin Rodary, Sebastian Wedekind, Pavel A. Ignatiev, Larissa Niebergall, Valeri S. Stepanyuk, Dirk Sander, Jürgen Kirschner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

We perform low-temperature spin-polarized scanning tunneling microscopy (SP-STM) and spectroscopy measurements in magnetic fields to gain new insights into nanomagnetism. We use the magnetic field to change and control magnetizations of a sample and a magnetic tip, and measure the magnetic hysteresis loops of individual Co nano-islands on Cu(111). We also exploit the high spatial resolution of SP-STM in magnetic fields to measure maps of the differential conductance within a single Co nano-island. In connection with ab initio calculations, we find that the spin polarization is not homogeneous but spatially modulated within the nano-island. We ascribe the spatial variation of the spin polarization to spin-dependent electron confinement within the Co nano-island.

Original languageEnglish
Title of host publicationSpintronics IV
DOIs
Publication statusPublished - 2011 Oct 11
Externally publishedYes
EventSpintronics IV - San Diego, CA, United States
Duration: 2011 Aug 212011 Aug 24

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8100
ISSN (Print)0277-786X

Conference

ConferenceSpintronics IV
CountryUnited States
CitySan Diego, CA
Period11/8/2111/8/24

Keywords

  • Co islands
  • Cu(111)
  • Electron confinement
  • Magnetic hysteresis loop
  • Nanomagnetism
  • Spin polarization
  • Spin-polarized scanning tunneling microscopy
  • Spin-polarized scanning tunneling spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Oka, H., Rodary, G., Wedekind, S., Ignatiev, P. A., Niebergall, L., Stepanyuk, V. S., Sander, D., & Kirschner, J. (2011). New insights into nanomagnetism: Spin-polarized scanning tunneling microscopy and spectroscopy studies. In Spintronics IV [81000O] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8100). https://doi.org/10.1117/12.892459