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Optical and magnetic properties of the DyN/GaN superlattice
Author(s) -
Zhou Y. K.,
Kim M. S.,
Teraguchi N.,
Suzuki A.,
Nanishi Y.,
Asahi H.
Publication year - 2003
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.200303321
Subject(s) - superlattice , photoluminescence , molecular beam epitaxy , ferromagnetism , substrate (aquarium) , materials science , spectral line , diffraction , epitaxy , condensed matter physics , crystallography , chemistry , optoelectronics , layer (electronics) , optics , physics , nanotechnology , oceanography , astronomy , geology
Ferromagnet/semiconductor DyN/GaN superlattice structures were grown on SiC substrate by radio frequency molecular beam epitaxy. Formation of DyN was confirmed by X‐ray diffraction measurements. The temperature dependence of the photoluminescence (PL) spectra for the DyN/GaN superlattice and GaDyN samples was studied. Sharp PL peaks from two samples showed no shift with temperature, indicating the intra‐atomic f–f transition at Dy ions. Comparison of the PL spectra for the DyN/GaN superlattice and GaDyN suggests that GaDyN is formed at the GaN/DyN interface. The DyN/GaN superlattice exhibited two ferromagnetic components; one is major at low temperatures (<50 K) and the other is major at high temperatures (>350 K). The former shows large coercivity H c of about 1800 Oe at 7 K, which was originated from DyN layers. The latter may come from GaDyN, which was formed at the GaN/DyN interface. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)