Speaker
Hilary Masenda
(University of the Witwatersrand)
Description
The lattice sites and valence states of Fe ions in InN were investigated by emission Mössbauer spectroscopy following the implantation of radioactive 57Mn+ ions at ISOLDE/CERN, stimulated by reports of ferromagnetic effects observed in virgin InN [1] and also when doped with 3d transition metals [2]. Angle dependent measurements performed at room temperature on the 14.4 keV γ-rays from the 57Fe Mössbauer state (populated from the 57Mn β− decay) reveal that the majority of the Fe ions are nearly substituting the In cations, and/or associated with N vacancy type defects. Emission Mössbauer spectroscopy measurements conducted over a temperature range of 105–723 K did not show the presence of magnetically split sextets in the “wings” of the spectra as observed in GaN and AlN [3] suggesting the absence of Fe3+ in the material.
References
[1] Xie, Q.Y., Gu, M.Q., Huang, L., Zhang, F.M., and Wu, X.S.: AIP Advances, 2 (2012) 012185.
[2] Belabbes, A., Zaoui, A., and Ferhat, M.: Appl. Phys. Lett., 97 (2010) 242509.
[3] Masenda, H., Naidoo, D., Bharuth-Ram, K., Gunnlaugsson, H.P., Johnston, K., Mantovan, R, Mølholt, T.E., Ncube, M, Shayestehaminzadeh, S., Gíslason, H.P., Langouche, G., Ólafsson, S., and Weyer, G.: J. Magn. Magn. Mater., 401 (2016) 1130.
Author
Hilary Masenda
(University of the Witwatersrand)
Co-authors
Deena Naidoo
(University of the Witwatersrand)
Guido LANGOUCHE
(Katholieke Universiteit Leuven)
Haflidi Petur Gislason
(U)
Haraldur Pall Gunnlaugsson
(KU Leuven (BE))
K. Bharuth-Ram
(Durban University of Technology)
Mehluli Ncube
(U)
Roberto Mantovan
Sveinn Olafsson
(U)
Torben Esmann Molholt
(CERN)
