Effect of CoTiO3 formation on the magnetic properties of co-doped TiO2 rutile

被引：0
作者：
Joh, YG [1 ]
Kim, HD
Kim, BY
Woo, SI
Moon, SH
Cho, JH
Kim, EC
Kim, DH
Cho, CR
机构：
[1] Yeungnam Univ, Dept Phys, Kyongsan 712749, South Korea
[2] Korea Basic Res Inst, Busan Branch, Pusan 609753, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2004年 / 44卷 / 02期
关键词：
magnetic semiconductors; hysteresis; solid-state reaction; ferromagnetism;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We studied the structural and the magnetic properties of TiO2 rutile powder with various Co concentrations synthesized by using a solid-state reaction. For Co concentrations higher that 2 a second phase of CoTiO3 was observed on the X-ray diffraction (XRD) experiment. The magnetization measurement showed room-temperature ferromagnetism in this material, but the magnetic moment per Co atom decreased significantly as the Co concentration was increased. We attribute this reduction of magnetization to the formation of non-magnetic CoTiO3 complexes as probed by XRD. For samples with Co concentrations less than 2%, the observed ferromagnetism seemed to be due to an exchange interaction between substitutional or interstitial Co atoms rather than to Co clusters.
引用
收藏
页码：360 / 364
页数：5
相关论文
共 21 条
[1]   Epitaxial growth and properties of ferromagnetic co-doped TiO2 anatase [J].
Chambers, SA ;
Thevuthasan, S ;
Farrow, RFC ;
Marks, RF ;
Thiele, JU ;
Folks, L ;
Samant, MG ;
Kellock, AJ ;
Ruzycki, N ;
Ederer, DL ;
Diebold, U .
APPLIED PHYSICS LETTERS, 2001, 79 (21) :3467-3469
[2]  
Chang YH, 2001, J KOREAN PHYS SOC, V39, P324
[3]  
DeBoeck J, 1996, APPL PHYS LETT, V68, P2744, DOI 10.1063/1.115584
[4]   Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].
Dietl, T ;
Ohno, H ;
Matsukura, F ;
Cibert, J ;
Ferrand, D .
SCIENCE, 2000, 287 (5455) :1019-1022
[5]   High temperature (>400 K) ferromagnetism, in III-V-based diluted magnetic semiconductor GaCrN grown by ECR molecular-beam epitaxy [J].
Hashimoto, M ;
Zhou, YK ;
Kanamura, M ;
Asahi, H .
SOLID STATE COMMUNICATIONS, 2002, 122 (1-2) :37-39
[6]   Formation of Co nanoclusters in epitaxial Ti0.96Co0.04O2 thin films and their ferromagnetism [J].
Kim, DH ;
Yang, JS ;
Lee, KW ;
Bu, SD ;
Noh, TW ;
Oh, SJ ;
Kim, YW ;
Chung, JS ;
Tanaka, H ;
Lee, HY ;
Kawai, T .
APPLIED PHYSICS LETTERS, 2002, 81 (13) :2421-2423
[7]  
Kim HJ, 2002, J KOREAN PHYS SOC, V40, P1069
[8]   Ferromagnetism induced by clustered Co in Co-doped anatase TiO2 thin films -: art. no. 017401 [J].
Kim, JY ;
Park, JH ;
Park, BG ;
Noh, HJ ;
Oh, SJ ;
Yang, JS ;
Kim, DH ;
Bu, SD ;
Noh, TW ;
Lin, HJ ;
Hsieh, HH ;
Chen, CT .
PHYSICAL REVIEW LETTERS, 2003, 90 (01)
[9]   Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide [J].
Matsumoto, Y ;
Murakami, M ;
Shono, T ;
Hasegawa, T ;
Fukumura, T ;
Kawasaki, M ;
Ahmet, P ;
Chikyow, T ;
Koshihara, S ;
Koinuma, H .
SCIENCE, 2001, 291 (5505) :854-856
[10]   (Ga,Mn)As: A new diluted magnetic semiconductor based on GaAs [J].
Ohno, H ;
Shen, A ;
Matsukura, F ;
Oiwa, A ;
Endo, A ;
Katsumoto, S ;
Iye, Y .
APPLIED PHYSICS LETTERS, 1996, 69 (03) :363-365
123