Mossbauer spectroscopy and magnetic susceptibility studies of Cr-Al substituted strontium ferrite particles

被引：21

作者：

Ghasemi, Ali ^{[1
]}

Sepelak, Vladimir ^{[2
]}

Liu, Xiaoxi ^{[1
]}

Morisako, Akimitsu ^{[1
]}

机构：

[1] Shinshu Univ, Fac Engn, Spin Device Technol Ctr, Nagano 3808553, Japan

[2] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 107卷 / 09期

关键词：

MICROWAVE-ABSORPTION PROPERTIES; NANOPARTICLES;

D O I：

10.1063/1.3339004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Substituted strontium ferrite SrFe(12-x)Cr(x/2)Al(x/2)O(19) (x=0-2.5) was prepared by sol-gel method. Ac susceptometer, and (57)Fe Mossbauer spectroscopy were used to analyze the structure, static and dynamic magnetic properties of the prepared samples. Mossbauer spectra show that Al-Cr ions preferentially occupy the 12k sites. Magnetic dynamics of the samples was studied by the measurement of ac magnetic susceptibility versus temperature at different frequencies and dc magnetic fields. A frequency-dependent peak was observed in ac magnetic susceptibility versus temperature, which is well described by Vogel-Fulcher model. It was observed that with increasing substitutions, blocking temperature is decreased. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3339004]

引用

页数：3

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