Electronic structure and magnetism of Mn dopants in GaN nanowires: Ensemble vs single nanowire measurements

Shokouh S. Farvid, Manu Hegde, Ian Dean Hosein, Pavle V. Radovanovic

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We studied the electronic structure and magnetization of Mn dopants in GaN nanowires at the ensemble and single nanowire levels by near edge x-ray absorption fine structure spectroscopies. The results of single nanowire measurements indicate that Mn adopts tetrahedral coordination in GaN nanowires and has mixed oxidation state (Mn2/Mn3), with Mn 2 being in relative majority. Ensemble nanowire spectra suggest co-deposition of Mn secondary phases alongside nanowires. Single nanowire x-ray magnetic circular dichroism indicates intrinsic magnetic ordering of Mn dopants at 300 K. In contrast, as-grown nanowire samples show only residual magnetization, due to nanowire orientation dependence of magnetization.

Original languageEnglish (US)
Article number222504
JournalApplied Physics Letters
Issue number22
StatePublished - Nov 28 2011
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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