Magnetostrictive strin effects in Pr/sub 6/Fe/sub 11/Ga/sub 3/ alloy

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005. Pub Date : 2005-04-04 DOI:10.1109/INTMAG.2005.1463586

M. Alinejad, N. Tajabor, A. Amirabadizadeh, F. Pourarian

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Abstract

In this research, magnetoelastic properties of Pr6Fe 11Ga3 alloy is studied by magnetostriction and thermal expansion measurements. The phase purity and micro-structure of the sample are studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. Temperature dependence of spontaneous volume magnetostriction for this alloy shows an increase as temperature decreases below Curie temperature TC = 320 K through a sequence of two steps. First step appears in the vicinity of TC and second one starts around 280 K. This originated from magnetoelastic effects of short range ferromagnetic order that have a nature of Fe-Fe exchange interaction. The second step is attributed to the gradual long range ordering of magnetic moments which is necessary for low temperature ferrimagnetic phase. At low field region, magnetorestrictive strain is small and smoothly increases for increasing fields. Observed increase in threshold field Ha at lower temperatures is attributed to the enhancing magnetocrystalline anisotropy of Pr sublattices. Also, as field increases over Ha, magnetic moments gradually rotates with domain walls motion

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Pr/sub 6/Fe/sub 11/Ga/sub 3/合金的磁致伸缩效应

本研究通过磁致伸缩和热膨胀测量研究了Pr6Fe 11Ga3合金的磁弹性性能。采用扫描电子显微镜(SEM)和x射线衍射仪(XRD)分析了样品的相纯度和微观结构。该合金的自发体积磁致伸缩的温度依赖性随着温度降低到居里温度TC = 320 K以下而增加。第一步出现在TC附近，第二步在280k左右开始。这源于具有Fe-Fe交换相互作用性质的短程铁磁序的磁弹性效应。第二步归因于磁矩的逐渐长程有序，这是低温铁磁相所必需的。在低场区，磁约束应变很小，且随场强的增大而平稳增大。在较低温度下观察到的阈值场Ha的增加归因于Pr亚晶格磁晶各向异性的增强。此外，当磁场在Ha上增加时，磁矩随畴壁运动逐渐旋转

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INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.

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