Structural and magnetic properties of amorphous iron oxide

被引：15
|
作者：
Yusuf, S. M. [1 ]
Mukadam, M. D. [1 ]
De Teresa, J. M. [2 ]
Ibarra, M. R. [2 ,3 ]
Kohlbrecher, J. [4 ,5 ]
Heinemann, A. [6 ]
Wiedenmann, A. [6 ]
机构：
[1] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
[2] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
[3] Univ Zaragoza, Inst Nanociencia Aragon, E-50009 Zaragoza, Spain
[4] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[5] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[6] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
来源：
PHYSICA B-CONDENSED MATTER | 2010年 / 405卷 / 04期
关键词：
Magnetic nanoparticles; Polarized neutron small angle scattering; NANOPARTICLES; FERROFLUIDS; SCATTERING;
D O I：
10.1016/j.physb.2009.11.040
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The structural and magnetic properties of amorphous Fe2O3 have been studied by polarized neutron small angle scattering, transmission electron microscopy (TEM) and dc magnetization techniques. The small angle neutron scattering (SANS) study shows two different lognormal distributions of particle sizes with mean diameters of similar to 4.14 and 1.21 nm with standard deviations 0.33 and 0.40, respectively, and the structure factor corresponds to a mass fractal with a fractal dimension of 2.42. A short-range crystalline nature for these nanoparticles has been confirmed from the high resolution TEM study. The magnetic field and temperature dependent magnetization has been found to scale very well with the SANS signal. It is evident from the field dependent polarized SANS study that the spin clusters do not grow in size under applied field; rather a larger spin alignment occurs under field. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：1202 / 1206
页数：5
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