Local increase of the Curie temperature in Mn/Fe implanted Y3Fe5O12 (YIG)

P B Krastev; H P Gunnlaugsson; K Nomura; K Bharuth-Ram; B Qi; H Masenda; T E Mølholt; D Naidoo; S Ólafsson; A Tarazaga Martín-Luengo; I Unzueta; K Johnston; J Schell; H P Gislason

doi:10.1016/j.apradiso.2020.109121

Local increase of the Curie temperature in Mn/Fe implanted Y₃Fe₅O₁₂ (YIG)

Appl Radiat Isot. 2020 Jun:160:109121. doi: 10.1016/j.apradiso.2020.109121. Epub 2020 Mar 4.

Authors

P B Krastev¹, H P Gunnlaugsson², K Nomura³, K Bharuth-Ram⁴, B Qi², H Masenda⁵, T E Mølholt⁶, D Naidoo⁵, S Ólafsson², A Tarazaga Martín-Luengo⁷, I Unzueta⁸, K Johnston⁹, J Schell¹⁰, H P Gislason²

Affiliations

¹ Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Boulevard, Sofia, 1784, Bulgaria. Electronic address: petko.krastev@cern.ch.
² Science Institute, University of Iceland, Dunhaga 3, IS-107, Reykjavík, Iceland.
³ Radioisotope Centre, Tokyo Metropolitan University, Minami-Osawa 1-1, Hatioji, Tokyo, 192-0397, Japan.
⁴ Physics Department, Durban University of Technology, Durban, 4000, South Africa; School of Physics, University of KwaZulu-Natal, Durban, 4001, South Africa.
⁵ School of Physics, University of the Witwatersrand, 2050, South Africa.
⁶ DTU Nutech, Risø Campus, Frederiksborgvej 399, B201, 4000, Roskilde, Denmark; EP Department, ISOLDE/CERN, 1211, Geneva 23, Switzerland.
⁷ Institute for Semiconductor and Solid State Physics, Magnetic Spin Materials Group, Johannes Kepler University, Altenbergerstr. 69, Linz, Austria.
⁸ Department of Applied Physics II, University of the Basque Country, 48940, Leioa, Spain.
⁹ EP Department, ISOLDE/CERN, 1211, Geneva 23, Switzerland.
¹⁰ EP Department, ISOLDE/CERN, 1211, Geneva 23, Switzerland; Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany.

PMID: 32174465
DOI: 10.1016/j.apradiso.2020.109121

Abstract

The change in the Curie temperature of single crystalline garnet Y₃Fe₅O₁₂ (YIG) sample due to lattice damage induced by ion implantation has been investigated in ⁵⁷Fe emission Mössbauer Spectroscopy (eMS) following implantation of ⁵⁷Mn (T_½ = 1.5 min). The Mössbauer spectra analysis reveal high spin Fe³⁺ 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_A-O-Fe_D distortion scheme.

Keywords: (57)Mn implantation; Emission Mössbauer spectroscopy; Local Curie temperature; Yttrium iron garnet Y(3)Fe(5)O(12) (YIG).