Defect induced local moment in ZnO as a consequence of Stoner mechanism

Chandra, Hirak Kumar ; Mahadevan, Priya (2012) Defect induced local moment in ZnO as a consequence of Stoner mechanism Solid State Communications, 152 (9). pp. 762-766. ISSN 0038-1098

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.ssc.2012.01.050

Abstract

We have examined the formation of a local moment by considering various defects in ZnO. The localization of the defect induced state is found to determine the presence/absence of a local moment. A lot of attention on the probable origin of magnetism in wide band gap oxides has focused on cation vacancies. Here we show that oxygen interstitial atoms give rise to a large magnetic moment which results in a spin polarization of both the conduction and valence bands, in addition to spin polarized gap states. A Stoner mechanism is invoked and the relevant Stoner parameters are determined to be 0.7 eV for an oxygen atom in the presence of an oxygen interstitial but reduced to 0.2 eV on oxygen in the presence of a Zn vacancy.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:A. ZnO; D. Defect Magnetism; D. Stoner Mechanism
ID Code:102871
Deposited On:02 Feb 2018 03:57
Last Modified:02 Feb 2018 03:57

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