Magneto-optical effect in GdN epitaxial thin film
authors Vidyasagar, R; Yoshitomi, H; Kitayama, S; Kita, T; Ohta, H; Sakurai, T
journal 15TH INTERNATIONAL CONFERENCE ON THIN FILMS (ICTF-15)
abstract We report the cooperative phenomena of magneto-optical effect in AlN/GdN/AlN heterostructure grown by reactive rf magnetron sputtering technique performed under a base pressure less than 5x10(-6) Pa. The ultra-high vacuum conditions during growth of GdN enable to curtail the oxophilicity character. The temperature dependent optical absorbance measurements have been carried out to evaluate the direct optical band gaps at the X point through the Tauc plots for the heterostructure. We observed for the first time that the optical absorbance studies demonstrate an exceptional splitting in valance and conduction bands in GdN below the critical temperature. The splitting energy is slightly increased with increase of temperature range of 30-55 K and the difference is merely Delta E=28 meV. Furthermore, the splitting energy drastically increases from 30 K to 3 K and the difference is Delta E=102 meV. This startling increase convincing that there is rapid increase of magnetic moments caused by long range correlation of spins.
publisher IOP PUBLISHING LTD
issn 1742-6588
year published 2013
volume 417
digital object identifier (doi) 10.1088/1742-6596/417/1/012053
web of science category Materials Science, Coatings & Films; Physics, Multidisciplinary
subject category Materials Science; Physics
unique article identifier WOS:000317122000053
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