Defect and adsorbate induced ferromagnetic spin-order in magnesium oxide nanocrystallites

Ashok Kumar, Jitendra Kumar, Shashank Priya

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28 Scopus citations

Abstract

We report the correlation between d 0 ferromagnetism, photoluminescence (PL), and adsorbed hydrogen (H -) species in magnesium oxide (MgO) nanocrystallites. Our study suggests that the oxygen vacancies, namely singly ionized anionic vacancies (F +) and dimers (F 2 2+) induce characteristic photoluminescence and the room-temperature ferromagnetic spin-order. Nanocrystallites with low population of oxygen vacancies have revealed diamagnetic behavior. Intriguingly, on adsorption of hydrogen (H -) species in the MgO nanocrystallites, ferromagnetic behavior was either enhanced (in the case of highly oxygen deficient nanocrystallites) or begun to percolate (in the case of nanocrystallite with low population density of oxygen vacancies).

Original languageEnglish (US)
Article number192404
JournalApplied Physics Letters
Volume100
Issue number19
DOIs
StatePublished - May 7 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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