Introducing and manipulating magnetic dopant exchange interactions in semiconductor nanowires

Manu Hegde, Ian D. Hosein, Tahereh Sabergharesou, Shokouh S. Farvid, Pavle V. Radovanovic

Research output: Chapter in Book/Entry/PoemConference contribution


The ability to control both spin and charge degrees of freedom in semiconductor nanostructrures is at heart of spintronic and quantum information technologies. Magnetically-doped semiconductor nanowires have emerged as a promising platform for spintronics, which warrants the exploration of their synthesis, electronic structure, and magnetic properties. Here we demonstrate the preparation of manganese-doped GaN and SnO2 nanowires by chemical vapor deposition and solvothermal methods, respectively. The investigation of both systems by electron microscopy and x-ray absorption spectroscopy at ensemble and single nanowire levels indicates that manganese dopants exist in a dual oxidation state, Mn2+ and Mn3+, with Mn2+ being the majority species. X-ray magnetic circular dichroism studies of individual nanowires suggest ferromagnetic interactions of manganese dopants, and the nanowire orientation-dependent magnetization owing to the magnetocrystalline anisotropy. The results of these studies demonstrate quantitative determination of the dopant electronic structure at the molecular level, and allow for a prediction of the magnetic properties of diluted magnetic semiconductor nanowires based on their orientation and geometry.

Original languageEnglish (US)
Title of host publicationSpintronics VI
StatePublished - 2013
Externally publishedYes
Event6th Spintronics Symposium - San Diego, CA, United States
Duration: Aug 25 2013Aug 29 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Other6th Spintronics Symposium
Country/TerritoryUnited States
CitySan Diego, CA


  • X-ray absorption spectroscopy
  • X-ray magnetic circular dichroism
  • diluted magnetic semiconductors
  • doping
  • gallium nitride
  • magnetic ordering
  • manganese
  • nanowires
  • scanning transmission X-ray microscopy
  • tin oxide

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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