NDLI: Room-temperature ferromagnetism in Co/sub x/Ti/sub (1-x)/O/sub 2/ powders made by sol-gel method: a NMR study

Content Provider	IEEE Xplore Digital Library
Author	Shihui Ge Xinwei Wang Xiaoming Kou Xueyun Zhou Li Xi Yalu Zuo Xiaolin Yang
Copyright Year	1965
Abstract	Co-doped TiO/sub 2/ system is one of the most promising candidates for room-temperature ferromagnetic semiconductors. However, the origin on its room-temperature ferromagnetism has not been totally understood. In this paper, Co/sub 0.04/Ti/sub 0.96/ O/sub 2/ powders were fabricated by sol-gel method. The structure and magnetic properties were investigated at different annealing conditions systematically with emphasis on the influence of oxygen pressure. Pure anatase structure was acquired for all samples annealed at 450/spl deg/C for 1 h except the one annealed in oxygen flow. The samples annealed in air exhibit evident room-temperature ferromagnetism with small magnetic moment of 0.029 /spl mu//sub B/ per Co atom, while the samples annealed in vacuum have strong ferromagnetism with larger magnetic moment of 1.18 /spl mu//sub B/ per Co atom. Zero field spin echo nuclear magnetic resonance spectrum of /sup 59/Co detected the existence of Co clusters in the latter samples, implying that the strong ferromagnetism in these samples annealed in vacuum comes from the Co clusters and is not the intrinsic property of the Co/sub 0.04/Ti/sub 0.96/O/sub 2/ materials.
Sponsorship	IEEE Magnetics Society
Starting Page	2721
Ending Page	2723
Page Count	3
File Size	106483
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Powders Nuclear magnetic resonance Annealing Magnetic materials III-V semiconductor materials Temperature X-ray lasers Magnetic semiconductors Magnetic properties Magnetic moments nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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