Lattice locations and properties of Fe in Co/Fe co-implanted ZnO

H.P. Gunnlaugsson; K. Johnston; T.E. Mølholt; G. Weyer; R. Mantovan; H. Masenda; D. Naidoo; S. Ólafsson; K. Bharuth-Ram; Morten Bo Madsen; H.P. Gislason

doi:10.1063/1.3679692

Lattice locations and properties of Fe in Co/Fe co-implanted ZnO

H.P. Gunnlaugsson, K. Johnston, T.E. Mølholt, G. Weyer, R. Mantovan, H. Masenda, D. Naidoo, S. Ólafsson, K. Bharuth-Ram, Morten Bo Madsen, H.P. Gislason

Astrophysics and Planetary Science

12 Citations (Scopus)

Abstract

The lattice locations and electronic configurations of Fe in ⁵⁷Co/ ⁵⁷Fe implanted ZnO (to (5-6) × 10 ¹⁴ Fe/cm ^-2) have been studied by ⁵⁷Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20 of the probe atoms as Fe ² on perturbed Zn sites and the remaining fraction as Fe ²⁺ in damage sites of interstitial character. After annealing at 773 K, ∼20 remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30 fraction occurs as high-spin Fe ³⁺, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal-doped ZnO.

Original language	English
Journal	Applied Physics Letters
Volume	100
Issue number	4
Pages (from-to)	042109
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.3679692
Publication status	Published - 23 Jan 2012

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title = "Lattice locations and properties of Fe in Co/Fe co-implanted ZnO",

abstract = "The lattice locations and electronic configurations of Fe in 57Co/ 57Fe implanted ZnO (to (5-6) × 10 14 Fe/cm -2) have been studied by 57Fe M{\"o}ssbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20 of the probe atoms as Fe 2 on perturbed Zn sites and the remaining fraction as Fe 2+ in damage sites of interstitial character. After annealing at 773 K, ∼20 remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30 fraction occurs as high-spin Fe 3+, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal-doped ZnO.",

author = "H.P. Gunnlaugsson and K. Johnston and T.E. M{\o}lholt and G. Weyer and R. Mantovan and H. Masenda and D. Naidoo and S. {\'O}lafsson and K. Bharuth-Ram and Madsen, {Morten Bo} and H.P. Gislason",

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doi = "10.1063/1.3679692",

language = "English",

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journal = "Applied Physics Letters",

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TY - JOUR

T1 - Lattice locations and properties of Fe in Co/Fe co-implanted ZnO

AU - Gunnlaugsson, H.P.

AU - Johnston, K.

AU - Mølholt, T.E.

AU - Weyer, G.

AU - Mantovan, R.

AU - Masenda, H.

AU - Naidoo, D.

AU - Ólafsson, S.

AU - Bharuth-Ram, K.

AU - Madsen, Morten Bo

AU - Gislason, H.P.

PY - 2012/1/23

Y1 - 2012/1/23

N2 - The lattice locations and electronic configurations of Fe in 57Co/ 57Fe implanted ZnO (to (5-6) × 10 14 Fe/cm -2) have been studied by 57Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20 of the probe atoms as Fe 2 on perturbed Zn sites and the remaining fraction as Fe 2+ in damage sites of interstitial character. After annealing at 773 K, ∼20 remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30 fraction occurs as high-spin Fe 3+, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal-doped ZnO.

AB - The lattice locations and electronic configurations of Fe in 57Co/ 57Fe implanted ZnO (to (5-6) × 10 14 Fe/cm -2) have been studied by 57Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20 of the probe atoms as Fe 2 on perturbed Zn sites and the remaining fraction as Fe 2+ in damage sites of interstitial character. After annealing at 773 K, ∼20 remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30 fraction occurs as high-spin Fe 3+, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal-doped ZnO.

U2 - 10.1063/1.3679692

DO - 10.1063/1.3679692

M3 - Journal article

SN - 0003-6951

VL - 100

SP - 042109

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

ER -

Lattice locations and properties of Fe in Co/Fe co-implanted ZnO

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