Magnetic and Electronic Properties of Reduced Rutile Ti<SUB>1-x</SUB>MnxO<SUP>2-δ</SUP> Thin Films

다국어 초록 (Multilingual Abstract)

Magnetic and electronic properties of reduced rutile titanium dioxide (TiO2-δ) thin films doped by Mn have been investigated. The present sol-gel-grown semiconducting TiO2-δ:Mn films exhibit a ferromagnetic behavior at room temperature for a limited range of Mn content. The Mn-doped films have p-type electrical conductivity with the carrier concentration near 1019 cm<SUP>?3</SUP>. The observed room-temperature ferromagnetism is believed to be intrinsic but not related to free carriers such as holes. Oxygen vacancies are likely to contribute to the room-temperature ferromagnetism?trapped carriers in oxygen vacancies can mediate a ferromagnetic coupling between neighboring Mn<SUP>3+</SUP> ions. The energy band-gap change due to the Mn doping measured by spectroscopic ellipsometry exhibits a red-shift compared to that of the undoped sample at low Mn content. It is explainable in terms of strong spin-exchange interactions between Mn ion and the carrier.

목차 (Table of Contents)

• 영어 초록
• 1. Introduction
• 2. Experimental
• 3. Results and Discussion
• 4. Conclusions
• Acknowledgments
• References