Magneto-optical effect in GdN epitaxial thin film

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.

subject category

Materials Science; Physics

authors

Vidyasagar, R; Yoshitomi, H; Kitayama, S; Kita, T; Ohta, H; Sakurai, T

our authors

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".