Magneto-optical studies of iron impurity in HVPE GaN

A. Niedzwiadek , A. Wysmolek (1) , D. Wasik , J. Szczytko , M. Kaminska , A. Twardowski (2) , M. L. Sadowski , M. Potemski (3) , B. Clerjaud (4) , B. Pastuszka , B. Lucznik , I. Grzegory

1 IFD - Institute of Experimental Physics [Warsaw]
2 IMGW - PIB - Institute of Meteorology and Water Management - National Research Institute
3 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
4 INSP - Institut des Nanosciences de Paris

We report on optical studies of bulk GaN crystals doped with iron. High-quality freestanding GaN crystals with varying Fermi level position were grown using the hydride vapor phase epitaxy on bulk GaN substrates. Samples with the dominant neutral Fe3+(3d(5)) acceptor state showed a characteristic near-infrared luminescence band around 1.3 eV, consisting of several sharp lines due to the fine structure of the T-4(1)(G)-(6)A(1)(S) internal transitions of isolated Fe3+ (d(5)) ions. In a magnetic field, these lines split into several components. This allowed us to determine energy structure of the T-4(1), multiplet in the magnetic field. For samples containing a singly ionized Fe2+(3d(6)) acceptor, absorption due to well-resolved E-5-T-5(2) internal transitions of Fe2+ was observed. Measurements performed at different temperatures ranging from 7 to 50 K and at magnetic fields up to 13 T enabled us to analyze some sublevels of the E-5 ground and the T-5(2) excited state. (C) 2007 Elsevier B.V. All rights reserved.

Mots clés: III-nitrides and compounds; iron impurity; intracenter transitions; spintronics

Domaines: Matière Condensée [cond-mat]

A. Niedzwiadek, A. Wysmolek, D. Wasik, J. Szczytko, M. Kaminska, et al.. Magneto-optical studies of iron impurity in HVPE GaN. Physica B: Condensed Matter, 2007, 401, pp.458-461. ⟨10.1016/j.physb.2007.08.211⟩. ⟨hal-01290170⟩