Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route

被引：827
作者：
Maaz, K.
Mumtaz, Arif [1 ]
Hasanain, S. K.
Ceylan, Abdullah
机构：
[1] Quaid I Azam Univ, Dept Phys, Islamabad, Pakistan
[2] Univ Delaware, Dept Phys & Astron, Newark, DE USA
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 308卷 / 02期
关键词：
ferrite nanoparticles; surface anisotropy; high coercivity magnetic materials;
D O I：
10.1016/j.jmmm.2006.06.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnetic nanoparticles of cobalt ferrite have been synthesized by wet chemical method using stable ferric and cobalt salts with oleic acid as the surfactant. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed the formation of single-phase cobalt ferrite nanoparticles in the range 15-48 urn depending on the annealing temperature and time. The size of the particles increases with annealing temperature and time while the coercivity goes through a maximum, peaking at around 28 run. A very large coercivity (10.5 kOe) is observed on cooling down to 77 K while typical blocking effects are observed below about 260 K. The high field moment is (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：289 / 295
页数：7
相关论文
共 16 条
[1]  
BERKOWITZ AE, 1959, J APPL PHYS, V30, P1345
[2]   Unusually high coercivity and critical single-domain size of nearly monodispersed CoFe2O4 nanoparticles [J].
Chinnasamy, CN ;
Jeyadevan, B ;
Shinoda, K ;
Tohji, K ;
Djayaprawira, DJ ;
Takahashi, M ;
Joseyphus, RJ ;
Narayanasamy, A .
APPLIED PHYSICS LETTERS, 2003, 83 (14) :2862-2864
[3]  
Craik D.J., 1975, MAGNETIC OXIDES, P703
[4]  
Fried T, 2001, ADV MATER, V13, P1158, DOI 10.1002/1521-4095(200108)13:15<1158::AID-ADMA1158>3.0.CO
[5]  
2-6
[6]  
HONRADA R, 2003, NNUN REU PROGRAM NAN, P106
[7]   Magnetic anisotropy and behaviors of Fe nanoparticles [J].
Ibusuki, T ;
Kojima, S ;
Kitakami, O ;
Shimada, Y .
IEEE TRANSACTIONS ON MAGNETICS, 2001, 37 (04) :2223-2225
[8]   Magnetic nanoparticles [J].
Kodama, RH .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :359-372
[9]   Synthesis of magnetic spinel ferrite CoFe2O4 nanoparticles from ferric salt and characterization of the size-dependent superparamagnetic properties [J].
Liu, C ;
Rondinone, AJ ;
Zhang, ZJ .
PURE AND APPLIED CHEMISTRY, 2000, 72 (1-2) :37-45
[10]  
MUMTAZ A, 2006, UNPUB J PHYS CONDENS
12