EPR characterization of Co-doped ZnO microwires and distant spin-pair coupling

Cobalt-doped ZnO microwires have been grown by the optical furnace method with Co concentration in the range 0-5%. The high crystallinity of these objects is demonstrated by the use of electron paramagnetic resonance (EPR), in which Co2+ ions serve as magnetic probes. The spin state of these isolate...

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Bibliographic Details
Published in:Semiconductor science and technology 2015-07, Vol.30 (7), p.75004
Main Authors: Savoyant, A, Giovannelli, F, Delorme, F, Stepanov, A
Format: Article
Language:English
Subjects:
Condensed Matter
electron paramagnetic resonance
Materials Science
microwires
Physics
zinc oxyde
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Summary:Cobalt-doped ZnO microwires have been grown by the optical furnace method with Co concentration in the range 0-5%. The high crystallinity of these objects is demonstrated by the use of electron paramagnetic resonance (EPR), in which Co2+ ions serve as magnetic probes. The spin state of these isolated magnetic impurities and their location in the host crystal are addressed by EPR, as well as the coupling constant between non-nearest Co2+-Co2+ neighbors. Eight of these distant spin pairs are detected, among which two are confirmed to be ferromagnetic. The problem of their localization in the wurtzite structure is discussed.
ISSN:0268-1242
1361-6641
DOI:10.1088/0268-1242/30/7/075004