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Oxygen vacancy enhanced room temperature ferromagnetism in Al-doped MgO nanoparticles

We have investigated the room temperature ferromagnetic order that develops in Al-substituted magnesium oxide, Mg(Al)O, nanoparticles with Al fractions of up to 5 at.%. All samples, including undoped MgO nanoparticles, exhibit room temperature ferromagnetism, with the saturation magnetization reaching a maximum of 0.023 emu/g at 2 at.% of Al. X-ray photoelectron spectroscopy identifies the presence of oxygen vacancies in both doped and undoped MgO nanoparticles, with the vacancy concentration increasing upon vacuum annealing of Mg(Al)O, resulting in two-fold enhancement of the saturation magnetization for 2 at.% Al-doped MgO. Our results suggest that the oxygen vacancies are largely responsible for room temperature ferromagnetism in MgO.

preprint2013arXivOpen access
Debabrata MishraBalaji P. MandalRupam MukherjeeRatna NaikGavin LawesBoris Nadgorny
cond-mat.mes-hallcond-mat.str-elcond-mat.mtrl-sci
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Open access6 authors3 topics
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Debabrata MishraBalaji P. MandalRupam MukherjeeRatna NaikGavin LawesBoris Nadgorny

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