Size and anisotropy effects on magnetic properties of antiferromagnetic nanoparticles

被引：73
作者：
Wesselinowa, J. M. [1 ]
机构：
[1] Univ Sofia, Dept Phys, Sofia 1164, Bulgaria
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2010年 / 322卷 / 02期
关键词：
Antiferromagnetic nanoparticles; Size and anisotropy effects; Green's function theory; INELASTIC NEUTRON-SCATTERING; NIO NANOPARTICLES; TEMPERATURE-DEPENDENCE; OXIDE NANOPARTICLES; CUO NANOPARTICLES; FINE PARTICLES; ALPHA-FE2O3; COERCIVITY; DYNAMICS; BEHAVIOR;
D O I：
10.1016/j.jmmm.2009.08.045
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on the Heisenberg model taking into account single-ion anisotropy and using a Green's function technique we have studied the influence of size and anisotropy effects on magnetization M, Neel temperature T(N), coercive field H(c) and spin excitation energy of antiferromagnetic nanoparticles. The properties are compared with those of ferromagnetic nanoparticles. We have shown that the enhanced magnetization M and coercive field H(c) of antiferromagnetic nanoparticles is a surface effect, which is due to uncompensated surface spins. Moreover, the shape of the coercive field curve can be significantly influenced by surface magnetic anisotropy. (C) 2009 Elsevier B. V. All rights reserved.
引用
收藏
页码：234 / 237
页数：4
相关论文
共 42 条
[1]   Uniform spin wave modes in antiferromagnetic nanoparticles with uncompensated moments [J].
Bahl, C. R. H. ;
Garde, J. ;
Lefmann, K. ;
Jensen, T. B. S. ;
Lindgard, P. -A. ;
Madsen, D. E. ;
Morup, S. .
EUROPEAN PHYSICAL JOURNAL B, 2008, 62 (01) :53-57
[2]   Uniform magnetic excitations in NiO nanopairticles [J].
Bahl, C. R. H. ;
Kuhn, L. Theil ;
Lefmann, K. ;
Lindgard, P. -A. ;
Morup, S. .
PHYSICA B-CONDENSED MATTER, 2006, 385 :398-400
[3]  
Bañobre-López M, 2003, NANOTECHNOLOGY, V14, P318, DOI 10.1088/0957-4484/14/2/342
[4]   Enhancement of surface magnetization in antiferromagnetic nanoparticles [J].
Bhowmik, R. N. ;
Ranganathan, R. .
SOLID STATE COMMUNICATIONS, 2007, 141 (07) :365-368
[5]   MnO and NiO nanoparticles: synthesis and magnetic properties [J].
Ghosh, M ;
Biswas, K ;
Sundaresan, A ;
Rao, CNR .
JOURNAL OF MATERIALS CHEMISTRY, 2006, 16 (01) :106-111
[6]   Magnetic ordering and phase transition in MnO embedded in a porous glass [J].
Golosovsky, IV ;
Mirebeau, I ;
André, G ;
Kurdyukov, DA ;
Kumzerov, YA ;
Vakhrushev, SB .
PHYSICAL REVIEW LETTERS, 2001, 86 (25) :5783-5786
[7]   Electronic structure and magnetic properties of small manganese oxide clusters [J].
Han, MJ ;
Ozaki, T ;
Yu, JJ .
JOURNAL OF CHEMICAL PHYSICS, 2005, 123 (03)
[8]  
Han MJ, 2006, J KOREAN PHYS SOC, V48, P1496
[9]   Magnetic dynamics of fine particles studied by inelastic neutron scattering [J].
Hansen, MF ;
Bodker, F ;
Morup, S ;
Lefmann, K ;
Clausen, KN ;
Lindgård, PA .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 221 (1-2) :10-25
[10]   Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles [J].
Iglesias, O ;
Labarta, A .
PHYSICA B-CONDENSED MATTER, 2006, 372 (1-2) :247-250
12345