Stability of cluster glass state in nano order sized YbFe2O4 powders
Stability of cluster glass state in nano order sized YbFe2O4 powders
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DOI：
10.1016/j.jpcs.2016.12.014
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发表时间：
2017-04
影响因子：
4
通讯作者：
H. Kobayashi;K. Fujiwara;N. Kobayashi;T. Ogawa;M. Sakai;M. Tsujimoto;O. Seri;S. Mori;N. Ikeda
中科院分区：
文献类型：
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作者：
H. Kobayashi;K. Fujiwara;N. Kobayashi;T. Ogawa;M. Sakai;M. Tsujimoto;O. Seri;S. Mori;N. Ikeda
研究了自旋和电荷阻挫系统YbFe_2O_4的慢磁弛豫和Fe离子的化学计量比。对Fe/Yb=2.00，2.02，2.04的纳米级YbFe 2 O 4单相粉体进行了直流磁化率、交流磁化率、时效过程和电子衍射观察。团簇玻璃行为的变化之间的关系进行了研究的磁弛豫和各种化学成分。随着Fe/Yb比的增加，磁相干长度增加，磁老化时间变慢。所观察到的临界减慢的玻璃态波动的自旋团簇大小的发展解释。这表明该材料的自旋玻璃性质来自于具有亚铁磁矩的各种尺寸磁畴之间的竞争。此外，电子衍射实验表明，随着Fe/Yb比从2.00增加，三角晶格中电荷有序相干性增强。研究表明，纳米级颗粒的磁涨落测量给出了RFe_2 O_4中自旋团簇涨落的基本信息。
Slow magnetic relaxation and the Fe ion stoichiometry were investigated in spin and charge frustrated system YbFe2O4. DC susceptibility, AC susceptibility, aging process and electron diffraction observation were carried out on nano order sized YbFe2O4single-phase powders with the Fe/Yb=2.00, 2.02, and 2.04 ratios. The variation of the cluster glass behavior was studied in relation between the magnetic relaxation and the various chemical compositions. With the increase of the Fe/Yb ratios, the magnetic coherence length increased and the magnetic aging time goes slow down. The observed critical slowing down of the glassy fluctuation is interpreted by the development of the spin cluster size. This indicates that the spin glass like property of this material arises from the competition between various sized magnetic domains having ferrimagnetic moments. Additionally, electron diffraction experiments showed that the increase of Fe/Yb ratios from Fe/Yb=2.00 enhances the development of the charge ordering coherence in triangular lattice. This study shows that the measurement of magnetic fluctuation for nano order sized particles gives the essential information about the spin cluster fluctuation inRFe2O4.