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 contributionpeer-review

2 Citations (Scopus)


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
Publication statusPublished - 2011
EventSpintronics IV - San Diego, CA, United States
Duration: 2011 Aug 212011 Aug 24

Publication series

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


ConferenceSpintronics IV
Country/TerritoryUnited States
CitySan Diego, CA


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


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