High-temperature magnetic properties of noninteracting randomly oriented single-domain Fe3−δO4 nanoparticles
作者： Jun Wang , Pieder Beeli , L.H. Meng , Guo-meng Zhao
DOI: 10.1016/J.PHYSLETA.2011.02.040
关键词: Curie temperature 、 Physics 、 Magnetocrystalline anisotropy 、 Coercivity 、 Condensed matter physics 、 Single domain 、 Magnetometer 、 Transmission electron microscopy 、 Range (particle radiation) 、 Nanoparticle
摘要: Abstract Magnetic measurements have been performed on 40-nm sphere-like Fe3 − δO4 ( δ = 0.043 ) nanoparticles using a Quantum Design vibrating sample magnetometer. Coating with SiO2 effectively eliminates magnetic interparticle interactions so that the coercive field H C in high-temperature range between 300 K and Curie temperature (855 K) can be well fitted by an expression for noninteracting randomly oriented single-domain particles. From fitting parameters, effective anisotropy constant is found to 1.38 ± 0.11 × 10 5 erg / cm 3 , which very close bulk magnetocrystalline of 1.35 . Moreover, inferred mean particle diameter from parameters quantitative agreement determined transmission electron microscope. Such data theory suggests ensemble our SiO2-coated represents good system randomly-oriented
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C. D. Graham, B. D. Cullity, Introduction to Magnetic Materials ,(1972)
Kenneth J Klabunde, Ryan M Richards, Nanoscale materials in chemistry Nanoscale Materials in Chemistry. pp. 304- ,(2001) , 10.1002/0471220620
J. L. Dormann, D. Fiorani, E. Tronc, Magnetic Relaxation in Fine‐Particle Systems John Wiley & Sons, Ltd. pp. 283- 494 ,(2007) , 10.1002/9780470141571.CH4
F. C. Voogt, T. Fujii, P. J. M. Smulders, L. Niesen, M. A. James, T. Hibma, NO2-assisted molecular-beam epitaxy of Fe3O4, Fe3-delta O4, and gamma-Fe2O3 thin films on MgO(100) Physical Review B. ,vol. 60, pp. 11193- 11206 ,(1999) , 10.1103/PHYSREVB.60.11193
Subarna Mitra, Kalyan Mandal, Superparamagnetic Behavior in Noninteracting NiFe2O4 Nanoparticles Grown in SiO2 Matrix Materials and Manufacturing Processes. ,vol. 22, pp. 444- 449 ,(2007) , 10.1080/10426910701233152
M. El-Hilo, K. O'Grady, R.W. Chantrell, Susceptibility phenomena in a fine particle system. I: Concentration dependence of the peak Journal of Magnetism and Magnetic Materials. ,vol. 114, pp. 295- 306 ,(1992) , 10.1016/0304-8853(92)90272-P
Farkhad G. Aliev, Miguel A. Correa-Duarte, Arif Mamedov, John W. Ostrander, Michael Giersig, Lius M. Liz-Marzán, Nicholas A. Kotov, Layer‐By‐Layer Assembly of Core‐Shell Magnetite Nanoparticles: Effect of Silica Coating on Interparticle Interactions and Magnetic Properties Advanced Materials. ,vol. 11, pp. 1006- 1010 ,(1999) , 10.1002/(SICI)1521-4095(199908)11:12<1006::AID-ADMA1006>3.0.CO;2-2
G. F. Goya, T. S. Berquó, F. C. Fonseca, M. P. Morales, Static and dynamic magnetic properties of spherical magnetite nanoparticles Journal of Applied Physics. ,vol. 94, pp. 3520- 3528 ,(2003) , 10.1063/1.1599959
Charles Kittel, Theory of the structure of ferromagnetic domains in films and small particles Physical Review. ,vol. 70, pp. 965- 971 ,(1946) , 10.1103/PHYSREV.70.965
J L Dormann, L Bessais, D Fiorani, A dynamic study of small interacting particles: superparamagnetic model and spin-glass laws Journal of Physics C: Solid State Physics. ,vol. 21, pp. 2015- 2034 ,(1988) , 10.1088/0022-3719/21/10/019