Spin canting and magnetic relaxation phenomena in Mn0.25Zn0.75Fe2O4
Spin canting and magnetic relaxation phenomena in Mn0.25Zn0.75Fe2O4
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DOI：
10.1016/s0304-8853(02)01237-4
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发表时间：
2003-03-01
影响因子：
2.7
通讯作者：
Morup, S
中科院分区：
文献类型：
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作者：
Anhoj, TA;Bilenberg, B;Morup, S
用穆斯堡尔谱和磁化强度测量研究了Mn_（0.25）Zn_（0.75）Fe_2 O_4铁氧体的磁性能。在低温和强磁场条件下测得的穆斯堡尔谱表明，几乎所有的Fe ~（3+）离子都位于八面体（B）晶位，只有约2%的Fe ~（3+）离子位于四面体（A）晶位。在5 K时，大约16%的B位Fe 3+离子具有平行于A位磁化强度的自旋，但是当温度升高到大约40 K时，这些自旋被反转。其他一些B位Fe 3+离子在5 K时表现出较大的自旋倾斜，并且这些离子在相对较低的温度下受到横向弛豫的显著影响。第三组13位离子在低温下具有可忽略的倾斜，并且这些离子在60 K以下仅轻微地受弛豫影响。在低温下，该材料可以被描述为团簇自旋玻璃。高于60 K的样品的一部分分裂成超顺磁性团簇，而其他部分保持亚铁磁性。(C)2002 Elsevier Science B. V.保留所有权利。
The magnetic properties of the ferrite Mn0.25Zn0.75Fe2O4 have been studied by Mossbauer spectroscopy and magnetisation measurements. Mossbauer spectra, obtained at low temperatures and large applied magnetic fields, showed that almost all Fe3+ ions are in octahedral (B) sites and only about 2% of the Fe3+ ions are in tetrahedral (A) sites. At 5 K about 16% of the B-site Fe3+ ions have spins parallel to the A-site magnetisation, but when the temperature is raised to about 40 K, these spins are reversed. Some other B-site Fe3+ ions show a large spin canting at 5 K and these ions are significantly affected by transverse relaxation at relatively low temperatures. A third group of 13-site ions has negligible canting at low temperatures and these ions are only slightly affected by relaxation below 60 K. At low temperatures the material can be described as a cluster spin glass. Above 60 K part of the sample breaks up into superparamagnetic clusters whereas other parts remain ferrimagnetic. (C) 2002 Elsevier Science B.V. All rights reserved.