Local increase of the Curie temperature in Mn/Fe implanted Y 3 Fe 5 O 12 (YIG)

The change in the Curie temperature of single crystalline garnet Y Fe O (YIG) sample due to lattice damage induced by ion implantation has been investigated in Fe emission Mössbauer Spectroscopy (eMS) following implantation of Mn (T  = 1.5 min). The Mössbauer spectra analysis reveal high spin Fe ion...

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Published in:Applied radiation and isotopes 2020-06, Vol.160, p.109121
Main Authors: Krastev, P B, Gunnlaugsson, H P, Nomura, K, Bharuth-Ram, K, Qi, B, Masenda, H, Mølholt, T E, Naidoo, D, Ólafsson, S, Martín-Luengo, A Tarazaga, Unzueta, I, Johnston, K, Schell, J, Gislason, H P
Format: Article
Language:English
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Summary:The change in the Curie temperature of single crystalline garnet Y Fe O (YIG) sample due to lattice damage induced by ion implantation has been investigated in Fe emission Mössbauer Spectroscopy (eMS) following implantation of Mn (T  = 1.5 min). The Mössbauer spectra analysis reveal high spin Fe ions substituted on both the octahedral and the tetrahedral sites. Measurements in the temperature range 298 K-798 K show that average values of the magnetic hyperfine field are decreased by the implantation-induced damage on the local lattice structure of the YIG. The Curie temperature, however, is determined to be 651 ± 5 K, considerably higher than the value of bulk YIG (559 K). This is most likely due to lattice damage-induced changes on the spin configurations of YIG through a Fe -O-Fe distortion scheme.
ISSN:1872-9800
DOI:10.1016/j.apradiso.2020.109121