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Photo‐EPR and magneto‐optical spectroscopy of iron centres in ZnO
Author(s) -
Azamat D. V.,
Debus J.,
Yakovlev D. R.,
Ivanov V. Yu.,
Godlewski M.,
Fanciulli M.,
Bayer M.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983224
Subject(s) - zeeman effect , electron paramagnetic resonance , spectroscopy , materials science , spintronics , condensed matter physics , excited state , paramagnetism , ferromagnetism , magnetic field , atomic physics , nuclear magnetic resonance , physics , quantum mechanics
Abstract ZnO has attracted increasing interest as promising material for optoelectronics and spintronics. Magnetic properties of ZnO can be controlled by doping with transition metal ions among which Fe 3+ is one of the interesting candidates. We report on the properties of Fe 3+ centres in hydrothermally and chemical vapour transport grown ZnO single crystals investigated by photo‐electron paramagnetic resonance (EPR) and optical spectroscopy. Detailed magneto‐optical studies of Zeeman components of spin‐forbidden electric dipole transitions 4 T 1 (G) → 6 A 1 ( 6 S) of Fe 3+ centre in ZnO reveal the trigonal symmetry of fine structure of lowest Γ 8 ( 4 T 1 ) excited state. The studies were performed in external magnetic fields up to 10 T and in the temperature range from 2 to 30 K. The energy positions of the Zeeman components at 8 T were measured as a function of the direction of applied magnetic field in $(1\bar {2}10)$ and (0001) planes. The detailed check of the angular variation of Zeeman lines shows two magnetically non‐equivalent Fe 3+ centres. These special features were accounted by contribution of higher rank Zeeman terms of dimension BJ 3 . The photo‐generated EPR spectra of trigonal Fe 3+ centres were detected in hydrothermally grown ZnO single crystals in addition to three types of charge compensated iron centres presented in these samples in the dark conditions.