Investigation at the atomic scale of the Co spatial distribution in Zn(Co)O magnetic semiconductor oxide

Abstract : A sputtered Zn 0.95 Co 0.05 O layer was chemically analyzed at the atomic scale in order to provide an accurate image of the distribution of Co atoms in the ZnO matrix. The investigation of the magnetic properties shows that the as-deposited Zn 0.95 Co 0.05 O is ferromagnetic at room temperature. Atom probe tomography reveals a homogeneous distribution of all chemical species in the layer and the absence of any Co clustering. This result proves that the ferromagnetic properties of this magnetic semiconductor cannot be attributed to a secondary phase or to metallic Co precipitates within the layer.
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R. Larde, E. Talbot, F. Vurpillot, Philippe Pareige, G. Schmerber, et al.. Investigation at the atomic scale of the Co spatial distribution in Zn(Co)O magnetic semiconductor oxide. Journal of Applied Physics, American Institute of Physics, 2009, 105 (12), pp.126107. ⟨10.1063/1.3152579⟩. ⟨hal-01633464⟩

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