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Magnetic study of Mg0.95Mn0.05Fe2O4 ferrite nanoparticles

机译：Mg0.95Mn0.05Fe2O4铁氧体纳米粒子的磁性研究

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摘要

The magnetic properties of Mg0.95Mn0.05Fe2O4 ferrite samples with an average particle size of similar to 6.0 +/- 0.6 nm have been studied using X-ray diffraction, Mossbauer spectroscopy, dc magnetization and frequency dependent real chi'(T) and imaginary chi"(T) parts of ac susceptibility measurements. A magnetic transition to an ordered state is observed at about 195 K from Mossbauer measurements. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization have been recorded at low field and show the typical behavior of a small particle system. The ZFC curve displays a broad maximum at T-mean = 195 +/- 5 K, a temperature which depends upon the distribution of particle volumes in the sample. The FC curve was nearly flat below T-mean, as compared with monotonically increasing characteristics of non-interacting superparamagnetic systems indicating the existence of strong interactions among the nanoparticles. A frequency-dependent peak observcd in chi'(T) is well described by Vogel-Fulcher law, yielding a relaxation time tau(0) = 5.8 x 10(-12) s and an interaction parameter T-0 = 195 +/- 3 K. Such values show the strong interactions and rule out the possibility of spin-glass (SG) features among the nanoparticle system. On the other hand fitting with the Neel-Brown model and the power law yields an unphysical large value of tau(0) (similar to 6 x 10(-69) and 1.2 x 10(-22) s respectively). (c) 2006 Elsevier Ltd. All rights reserved.
机译：使用X射线衍射，Mossbauer光谱，直流磁化强度和频率相关的真实chi'（T）和虚数研究了Mg0.95Mn0.05Fe2O4铁氧体样品的磁性能，这些样品的平均粒径接近6.0 +/- 0.6 nm磁化率测量的“ T”部分。从Mossbauer测量中观察到，在大约195 K处观察到有序磁化。零场冷（ZFC）和场冷（FC）磁化强度已记录为较低ZFC曲线在T均值= 195 +/- 5 K时显示出极大的最大值，该温度取决于样品中颗粒体积的分布，FC曲线接近与非相互作用的超顺磁系统的单调增加特征表明纳米粒子之间存在强相互作用相比，T-均值以下的平坦度由Vogel-Fu很好地描述了在chi'（T）中观察到的频率相关峰依歇尔定律，产生弛豫时间tau（0）= 5.8 x 10（-12）s和相互作用参数T-0 = 195 +/- 3K。这些值显示出强相互作用，并排除了自旋玻璃的可能性（SG）纳米粒子系统中的功能。另一方面，使用Neel-Brown模型和幂定律拟合会产生非物理的tau（0）值（分别类似于6 x 10（-69）和1.2 x 10（-22）s）。 （c）2006 Elsevier Ltd.保留所有权利。

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