Study of Magnetic and Electrical Properties of Nanocrystalline Mn Doped NiO

被引:11
作者
Raja, S. Philip [1 ]
Venkateswaran, C. [1 ]
机构
[1] Univ Madras, Ctr Mat Sci, Dept Nucl Phys, Madras 600025, Tamil Nadu, India
关键词
Oxide Semiconductors; NiO; Mn-Doped; Chemical Method; Magnetism; ROOM-TEMPERATURE FERROMAGNETISM; OPTICAL-PROPERTIES; SEMICONDUCTORS; TRANSITION; SPINTRONICS; CRYSTAL; OXIDE;
D O I
10.1166/jnn.2011.2721
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Diluted Magnetic Semiconductors (DMS) are intensively explored in recent years for its applications in spintronics, which is expected to revolutionize the present day information technology. Nanocrystalline Mn doped NiO samples were prepared using chemical co-precipitation method with an aim to realize room temperature ferromagnetism. Phase formation of the samples was studied using X-ray diffraction-Rietveld analysis. Scanning electron microscopy and Energy dispersive X-ray analysis results reveal the nanocrystalline nature of the samples, agglomeration of the particles, considerable particle size distribution and the near stoichiometry. Thermomagnetic curves confirm the single-phase formation of the samples up to 1% doping of Mn. Vibrating Sample Magnetometer measurements indicate the absence of ferromagnetism at room temperature. This may be due to the low concentration of Mn2+ ions having weak indirect coupling with Ni2+ ions. The lack of free carriers is also expected to be the reason for the absence of ferromagnetism, which is in agreement with the results of resistivity measurements using impedance spectroscopy. Arrhenius plot shows the presence of two thermally activated regions and the activation energy for the nanocrystalline Mn doped sample was found to be greater than that of undoped NiO. This is attributed to the doping effect of Mn. However, the dielectric constant of the samples was found to be of the same order of magnitude very much comparable with that of undoped NiO.
引用
收藏
页码:2747 / 2751
页数:5
相关论文
共 28 条
[1]   Electrical and optical properties of narrow-band materials [J].
Adler, David ;
Feinleib, Julius .
PHYSICAL REVIEW B-SOLID STATE, 1970, 2 (08) :3112-3134
[2]   Physical properties and x-ray diffraction of a NiMn2O4 single crystal below and above the ferrimagnetic transition at T-c=145 K [J].
Asbrink, S ;
Waskowska, A ;
Drozd, M ;
Talik, E .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1997, 58 (05) :725-729
[3]   EXCHANGE STRICTION IN NIO [J].
BARTEL, LC ;
MOROSIN, B .
PHYSICAL REVIEW B, 1971, 3 (03) :1039-&
[4]  
Becerra AM, 2005, J CHIL CHEM SOC, V50, P465, DOI 10.4067/S0717-97072005000200005
[5]   POLARONIC RELAXATION IN PEROVSKITES [J].
BIDAULT, O ;
MAGLIONE, M ;
ACTIS, M ;
KCHIKECH, M ;
SALCE, B .
PHYSICAL REVIEW B, 1995, 52 (06) :4191-4197
[6]   Structural and magnetic characterization of Fe3O4/Mn3O4 superlattices [J].
Chern, G ;
Horng, L ;
Lin, MZ ;
Li, SM ;
Lee, DS ;
Hou, TY ;
Tai, MF ;
Wu, TH .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 209 (1-3) :138-141
[7]   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
[8]   Exploration of oxide-based diluted magnetic semiconductors toward transparent spintronics [J].
Fukumura, T ;
Yamada, Y ;
Toyosaki, H ;
Hasegawa, T ;
Koinuma, H ;
Kawasaki, M .
APPLIED SURFACE SCIENCE, 2004, 223 (1-3) :62-67
[9]   Exchange bias and the origin of room-temperature ferromagnetism in Fe-doped NiO bulk samples [J].
He, J. H. ;
Yuan, S. L. ;
Yin, Y. S. ;
Tian, Z. M. ;
Li, P. ;
Wang, Y. Q. ;
Liu, K. L. ;
Wang, C. H. .
JOURNAL OF APPLIED PHYSICS, 2008, 103 (02)
[10]  
KEPPLER H, 1992, AM MINERAL, V77, P62