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Title: 57Fe Emission Mossbauer study on Gd3Ga5O12 implanted with dilute 57Mn
Authors: Krastev, P. B. 
Gunnlaugsson, H. P. 
Nomura, K. 
Adoons, V. 
Gerami, A. M. 
Johnston, K. 
Ncube, M. 
Mantovan, R. 
Masenda, Hilary 
Matveyev, Y. A. 
Mølholt, Torben Esmann 
Unzueta, I. 
Bharuth-Ram, Krish 
Gíslason, H. 
Langouche, G. 
Naidoo, D. 
Ólafsson, S. 
Keywords: Gadolinium gallium garnet (Gd3Ga5O12);57Mn implantation;M¨ossbauer emission spectroscopy;Fe sites
Issue Date: 2016
Publisher: Springer International Publishing Switzerland
Source: Krastev, P.B. 2016. 57Fe Emission Mossbauer study on Gd3Ga5O12 implanted with dilute 57Mn. Hyperfine Interact. 237(37): 1-6.
Journal: Hyperfine interactions (Dordrecht. Online) 
57Fe emission M¨ossbauer spectroscopy has been applied to study the lattice location and properties of Fe in gadolinium gallium garnet Gd3Ga5O12 (GGG) single crystals in the temperature interval 300 – 563 K within the extremely dilute (<10−4 at.%) regime following the implantation of 57Mn (T1/2 = 1.5 min.) at ISOLDE/CERN. These results are compared with earlier M¨ossbauer spectroscopy study of Fe-doped gadolinium gallium garnet Gd3Ga5O12(GGG), with implantation fluences between 8×1015 and 6×1016 atoms cm−2. Three Fe components are observed in the emission M¨ossbauer spectra: (i) high spin Fe2+ located at damage sites due to the implantation process, (ii) high spin Fe3+ at substitu-tional tetrahedral Ga sites, and (iii) interstitial Fe, probably due to the recoil imparted on the daughter 57∗Fe nucleus in the β− decay of 57Mn. In contrast to high fluence 57Fe implanta-tion studies the Fe3+ ions are found to prefer the tetrahedral Ga site over the octahedral Ga site. No annealing stages are evident in the temperature range investigated. Despite the very low concentration, high-spin Fe3+ shows fast spin relaxation, presumably due to an indirect interaction between nearby gadolinium atoms.
ISSN: 0304-3843 (print)
1572-9540 (online)
DOI: 10.1007/s10751-016-1266-9
Appears in Collections:Research Publications (Applied Sciences)

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