Stress dependent magnetostriction in highly magnetostrictive Fe100−xGax, 20
Stress dependent magnetostriction in highly magnetostrictive Fe100−xGax, 20
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DOI：
10.1063/1.3058685
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发表时间：
2009-02
影响因子：
3.2
通讯作者：
A. Clark;J. Yoo;J. Cullen;M. Wun-Fogle;G. Petculescu;A. Flatau
中科院分区：
文献类型：
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作者：
A. Clark;J. Yoo;J. Cullen;M. Wun-Fogle;G. Petculescu;A. Flatau
在Fe100−xGax单晶棒（直径为25×6mm）的[100]轴上的饱和磁致伸缩测量被观察到与[100]施加的压应力（20<x<30）有线性关系。这是线性磁弹性理论所不期望的，并且对于x=19.5确实可以忽略不计。将磁弹性理论扩展到包括三阶弹性项，揭示了引起应力相关[100]磁致伸缩项的存在。当x=20.9和29.5时，饱和磁致伸缩的应力T依赖性分别为0.136×10−6TMPa−1和0.281×10−6TMPa−1。三阶弹性常数，C3的，从这些值计算的值同意在符号和幅度与应力相关的测量杨氏模量和泊松比。总之，我们得出结论，0<x<30的Fe100−xGax磁致伸缩可以归因于一个简单的均匀单畴磁致弹性机制。
Saturation magnetostriction measurements along the [100] axis of Fe100−xGax single crystal rods (∼25×6mm diameter) were observed to have a linear dependence on [100] applied compressive stresses for 20<x<30. This is not expected from linear magnetoelastic theory and indeed is negligible for x=19.5. An expansion of the magnetoelastic theory to include third order elastic terms reveals the existence of a term that gives rise to a stress dependent [100] magnetostriction. For x=20.9 and 29.5, the stress T dependencies of the saturation magnetostrictions were found to be 0.136×10−6TMPa−1 and 0.281×10−6TMPa−1, respectively. Values of the third order elastic constants, c3’s, calculated from these values agree both in sign and magnitude with those obtained from stress dependent measurements of Young’s moduli and Poisson’s ratios. In sum, we conclude that the Fe100−xGax magnetostriction for 0<x<30 can be attributed to a simple homogenous single domain magnetoelastic mechanism.