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

Ashok Kumar; Jitendra Kumar; Shashank Priya

doi:10.1063/1.4712058

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

Ashok Kumar, Jitendra Kumar, Shashank Priya

Materials Science and Engineering

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40 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 language	English (US)
Article number	192404
Journal	Applied Physics Letters
Volume	100
Issue number	19
DOIs	https://doi.org/10.1063/1.4712058
State	Published - May 7 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4712058

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title = "Defect and adsorbate induced ferromagnetic spin-order in magnesium oxide nanocrystallites",

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).",

author = "Ashok Kumar and Jitendra Kumar and Shashank Priya",

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T1 - Defect and adsorbate induced ferromagnetic spin-order in magnesium oxide nanocrystallites

AU - Kumar, Ashok

AU - Kumar, Jitendra

AU - Priya, Shashank

N1 - Funding Information: This work was supported by the office of basic energy sciences, Department of energy through the Grant No. DE-FG02-08ER 46484.

PY - 2012/5/7

Y1 - 2012/5/7

N2 - 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).

AB - 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).

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

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