Ferromagnetism in Gd doped ZnO nanowires: A first principles study

Handle URI:
http://hdl.handle.net/10754/552142
Title:
Ferromagnetism in Gd doped ZnO nanowires: A first principles study
Authors:
Aravindh, S. Assa; Schwingenschlögl, Udo ( 0000-0003-4179-7231 ) ; Roqan, Iman S. ( 0000-0001-7442-4330 )
Abstract:
In several experimental studies, room temperature ferromagnetism in Gd-doped ZnO nanostructures has been achieved. However, the mechanism and the origin of the ferromagnetism remain controversial. We investigate the structural, magnetic, and electronic properties of Zn 48O48 nanowires doped with Gd, using density functional theory. Our findings indicate that substitutionally incorporated Gd atoms prefer occupying the surface Zn sites. Moreover, the formation energy increases with the distance between Gd atoms, signifying that no Gd-Gd segregation occurs in the nanowires within the concentration limit of ≤2%. Gd induces ferromagnetism in ZnO nanowires with magnetic coupling energy up to 21 meV in the neutral state, which increases with additional electron and O vacancy, revealing the role of carriers in magnetic exchange. The potential for achieving room temperature ferromagnetism and high TC in ZnO:Gd nanowires is evident from the large ferromagnetic coupling energy (200 meV) obtained with the O vacancy. Density of states shows that Fermi level overlaps with Gd f states with the introduction of O vacancy, indicating the possibility of s-f coupling. These results will assist in understanding experimental findings in Gd-doped ZnO nanowires.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Ferromagnetism in Gd doped ZnO nanowires: A first principles study 2014, 116 (23):233906 Journal of Applied Physics
Journal:
Journal of Applied Physics
Issue Date:
19-Dec-2014
DOI:
10.1063/1.4904860
Type:
Article
ISSN:
0021-8979; 1089-7550
Additional Links:
http://scitation.aip.org/content/aip/journal/jap/116/23/10.1063/1.4904860
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorAravindh, S. Assaen
dc.contributor.authorSchwingenschlögl, Udoen
dc.contributor.authorRoqan, Iman S.en
dc.date.accessioned2015-05-04T16:04:15Zen
dc.date.available2015-05-04T16:04:15Zen
dc.date.issued2014-12-19en
dc.identifier.citationFerromagnetism in Gd doped ZnO nanowires: A first principles study 2014, 116 (23):233906 Journal of Applied Physicsen
dc.identifier.issn0021-8979en
dc.identifier.issn1089-7550en
dc.identifier.doi10.1063/1.4904860en
dc.identifier.urihttp://hdl.handle.net/10754/552142en
dc.description.abstractIn several experimental studies, room temperature ferromagnetism in Gd-doped ZnO nanostructures has been achieved. However, the mechanism and the origin of the ferromagnetism remain controversial. We investigate the structural, magnetic, and electronic properties of Zn 48O48 nanowires doped with Gd, using density functional theory. Our findings indicate that substitutionally incorporated Gd atoms prefer occupying the surface Zn sites. Moreover, the formation energy increases with the distance between Gd atoms, signifying that no Gd-Gd segregation occurs in the nanowires within the concentration limit of ≤2%. Gd induces ferromagnetism in ZnO nanowires with magnetic coupling energy up to 21 meV in the neutral state, which increases with additional electron and O vacancy, revealing the role of carriers in magnetic exchange. The potential for achieving room temperature ferromagnetism and high TC in ZnO:Gd nanowires is evident from the large ferromagnetic coupling energy (200 meV) obtained with the O vacancy. Density of states shows that Fermi level overlaps with Gd f states with the introduction of O vacancy, indicating the possibility of s-f coupling. These results will assist in understanding experimental findings in Gd-doped ZnO nanowires.en
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/jap/116/23/10.1063/1.4904860en
dc.rightsArchived with thanks to Journal of Applied Physicsen
dc.titleFerromagnetism in Gd doped ZnO nanowires: A first principles studyen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Applied Physicsen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorSchwingenschlögl, Udoen
kaust.authorRoqan, Iman S.en
kaust.authorAravindh, S. Assaen
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