Magnetic anisotropy and magnetostriction in a Lu2Fe17 intermetallic single crystal
Magnetic anisotropy and magnetostriction in a Lu2Fe17 intermetallic single crystal
复制标题
Lu2Fe17金属间化合物单晶的磁各向异性和磁致伸缩
DOI：
10.1134/1.1402229
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发表时间：
2001
影响因子：
0.6
通讯作者：
Yu. G. Pastushenkov
中科院分区：
文献类型：
--
作者：
S. Nikitin;I. Tereshina;N. Pankratov;E. Tereshina;Y. Skourski;K. Skokov;Yu. G. Pastushenkov
研究了Lu_2Fe_（17）单晶的磁各向异性和磁致伸缩特性。在4.2-300 K范围内测量了磁各向异性常数K_1的温度依赖性。所得结果与Callen理论公式计算的数据进行了比较。结果表明，Lu_2Fe_（17）单晶的K_1随温度的变化规律偏离了局域单离子模型预测的温度曲线。由此推断，带电子的磁各向异性对Lu_2Fe_（17）化合物的磁各向异性有一定的贡献。研究了Lu 2Fe 17单晶的纵向、横向和体积磁致伸缩，并计算了磁致伸缩常数。结果表明，Lu_2Fe_（17）的交换积分与Y_2Fe_（17）的交换积分一样，基本上取决于原子体积。这种依赖性是造成Lu 2Fe 17和Y2 Fe 17化合物的居里温度之间的显著差异的原因。结果表明，Lu_2Fe_（17）单晶在磁相变温度范围内的磁致伸缩是由双离子交换和单离子贡献决定的。
The magnetic anisotropy and magnetostriction of a Lu2Fe17 single crystal are investigated. The temperature dependence of the magnetic anisotropy constant K1 is measured in the range 4.2–300 K. The results obtained are compared with the data calculated using the Callen theoretical formula. It is found that the temperature dependence of K1 for the Lu2Fe17 single crystal deviates from the temperature curve predicted by the localized single-ion model. The inference is drawn that a certain contribution to the magnetic anisotropy of the Lu2Fe17 compound is made by the magnetic anisotropy of band electrons. The longitudinal, transverse, and volume magnetostrictions of the Lu2Fe17 single crystal are studied, and the magnetostriction constants are calculated. It is demonstrated that the exchange integral of Lu2Fe17, as for the Y2Fe17 compound, substantially depends on the atomic volume. This dependence is responsible for the considerable difference between the Curie temperatures of the Lu2Fe17 and Y2Fe17 compounds. It is revealed that the magnetostriction of the Lu2Fe17 single crystal in the temperature range of the magnetic phase transition is determined by the two-ion exchange and single-ion contributions.