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首页> 外文期刊>Physica, B. Condensed Matter >The effect of Dy content on magnetoelastic coupling in Nd2-xDyxFe14C compounds
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The effect of Dy content on magnetoelastic coupling in Nd2-xDyxFe14C compounds

机译：Dy含量对Nd2-xDyxFe14C化合物中磁弹性耦合的影响

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In this research the effect of partial replacement of Nd by Dy atoms on magnetoelastic properties of Nd2Fe14C (2-14-1) alloys is studied by magnetostriction measurement of Nd2-xDyxFe14C with x = 0. 1, 0.3, 0.5 samples at 77 K up to 300 K temperatures. Spin re-orientation temperature, T-sr, is also determined by measuring temperature dependence of magnetic susceptibility in this range. Results show that spin re-orientation temperature increases rapidly with increasing Dy content up to x = 0.3. But, T-sr was not affected with higher Dy substitution, substantially. Magnetostriction results show that the partial substitution of Dy increases the anisotropic magnetostriction, which is attributed to stronger magnetocrystalline anisotropy. Dy partial substitution also changes magnetoelastic energy of the two spin phases of high and low temperatures. Increasing x causes the single particle contribution in magnetoelastic energy of low-temperature phase to increase rapidly, so that Callens theory would be sufficient for describing observed temperature dependence of magnetostriction. In addition, partial substitution of Dy with x = 0.3 and 0.5 causes a rapid increase in volume magnetostriction after T-sr, i.e. in the high-temperature phase. This rapid increase in volume magnetostriction indicates that the exchange interaction contribution in the magnetoelastic energy is promoted at the high-temperature phase by Dy substitution. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 13]
机译：在本研究中，通过在x = 0时对Nd2-xDyxFe14C进行磁致伸缩测量，研究了在77 K或更高温度下通过Dy原子部分置换Nd对Nd2Fe14C（2-14-1）合金的磁弹性性能的影响。到300 K的温度。通过在该范围内测量磁化率的温度依赖性，还可以确定自旋重取向温度T-sr。结果表明，自旋重取向温度随着Dy含量的增加而迅速增加，直至x = 0.3。但是，T-sr基本上不受较高的Dy取代影响。磁致伸缩结果表明，Dy的部分取代增加了各向异性磁致伸缩，这归因于较强的磁晶各向异性。 Dy部分取代还改变了高温和低温两个自旋相的磁弹性能。 x的增加导致低温相的磁弹性能量中的单个粒子贡献迅速增加，因此，卡伦斯理论足以描述所观察到的磁致伸缩的温度依赖性。另外，用x ＝ 0.3和0.5部分地置换Dy使T-sr后，即在高温相中，体积磁致伸缩迅速增加。体积磁致伸缩的这种快速增加表明，在高温阶段，通过Dy取代促进了磁弹性能量中的交换相互作用贡献。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：13]

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