Electronic structure and magnetic properties of Co doped TiO2 thin films using X-ray absorption spectroscopy

被引：18

作者：

Kumar, Shalendra ^{[1
,2
]}

Park, J. S. ^{[2
]}

Kim, D. J. ^{[2
]}

Lee, M. H. ^{[2
]}

Song, Tae Kwon ^{[2
]}

Gautam, Sanjeev ^{[3
]}

Chae, K. H. ^{[3
]}

Kim, S. S. ^{[4
]}

Kim, M. -H. ^{[2
]}

机构：

[1] Changwon Natl Univ, Inst Basic Sci, Chang Won 641773, Gyeongnam, South Korea

[2] Changwon Natl Univ, Sch Mat Sci & Engn, Chang Won 641773, Gyeongnam, South Korea

[3] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 136791, South Korea

[4] Changwon Natl Univ, Dept Phys, Chang Won 641773, Gyeongnam, South Korea

来源：

CERAMICS INTERNATIONAL | 2015年 / 41卷

基金：

新加坡国家研究基金会;

关键词：

Magnetic properties; Electronic material; Thin film; PLD; NEXAFS; ROOM-TEMPERATURE FERROMAGNETISM;

D O I：

10.1016/j.ceramint.2015.03.209

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The thin film of Ti0.93Co0.05O2-delta has been grown on LaAlO3 (100) substrate using pulsed laser deposition method. X-ray diffraction, near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, X-ray magnetic circular dichroism (XMCD) and magnetic hysteresis loop measurements were used to fully understand the origin of ferromagnetism. Our structural analysis reveals a single phase nature of the film and excludes the presence of any secondary phase. NEXAFS spectra collected at Ti L-3,L-2, and Co L-3,L-2 -edge infer that Co and Ti ions are in 2+ and 4+ valence states, respectively. Multiplet calculation performed at Co L-3,L-2 -edge also support the experimental observations and shows that Co ions are in 2+ valence state in O-h (octahedral) symmetry. Zero field cooled and field cooled magnetization infer that T-C of Ti0.95Co0.05O2-delta film is above room temperature. DC magnetization hysteresis loop study and XMCD measurement at Co L-3,L-2 -edge reflect that Ti0.95Co0.05O2-delta film exhibits ferromagnetic ordering at room temperature. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：S370 / S375

页数：6

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