Temperature and stress dependencies of the magnetic and magnetostrictive properties of Fe0.81Ga0.19
Temperature and stress dependencies of the magnetic and magnetostrictive properties of Fe0.81Ga0.19
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DOI：
10.1063/1.1452216
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发表时间：
2002-05-15
影响因子：
3.2
通讯作者：
Lograsso, TA
中科院分区：
文献类型：
--
作者：
Kellogg, RA;Flatau, AB;Lograsso, TA
最近有报道称，添加LiGa使Fe的饱和磁致伸缩（λ（100））增加了十倍以上，同时使菱面体磁致伸缩（λ（111））几乎不变。为了确定磁致伸缩和磁化强度之间的关系，我们测量了在14.4 MPa至87.1 MPa的压缩应力下，从-21 ℃至+80 ℃的磁致伸缩和磁化强度的温度和应力依赖性。在这项研究中，将Fe 0.81Ga 0.19的单晶棒从800 ℃淬火到水中，以确保Ga原子的几乎随机分布。恒温测试表明，需要大于14.4 MPa的压应力来实现最大磁致伸缩。当压应力为45.3MPa，外加磁场为800 Oe时，80 ℃时的最大磁致伸缩比-21 ℃时的最大磁致伸缩降低了12.9%。在相同的温度范围内，这种小的磁致伸缩降低与磁化强度相应的小的3.6%的降低是一致的。这种良好的温度响应使得这种合金对于工业和军事智能致动器、传感器和主动阻尼应用特别有价值。杨氏模量的测量值很低（约为55 +/-1GPa），几乎与温度无关。在很宽的温度范围内的大的磁致伸缩结合的非脆性性质的合金是罕见的。(C)2002年美国物理学会。
It was recently reported that the addition of nonmagnetic Ga increased the saturation magnetostriction (lambda(100)) of Fe over tenfold while leaving the rhombohedral magnetostriction (lambda(111)) almost unchanged. To determine the relationship between the magnetostriction and the magnetization we measured the temperature and stress dependence of both the magnetostriction and magnetization from -21 degreesC to +80 degreesC under compressive stresses ranging from 14.4 MPa to 87.1 MPa. For this study a single crystal rod of Fe0.81Ga0.19 was quenched from 800 degreesC into water to insure a nearly random distribution of Ga atoms. Constant temperature tests showed that compressive stresses greater than 14.4 MPa were needed to achieve the maximum magnetostriction. For the case of a 45.3 MPa compressive stress and applied field of 800 Oe, the maximum magnetostriction at 80 degreesC decreases from its value at -21 degreesC by 12.9%. This small magnetostrictive decrease is consistent with a correspondingly small 3.6% decrease in magnetization over the same temperature range. This well-behaved temperature response makes this alloy particularly valuable for industrial and military smart actuator, transducer, and active damping applications. The measured value of Young's modulus is low (similar to55+/-1 GPa) and almost temperature independent. The large magnetostriction over a wide temperature range combined with the nonbrittle nature of the alloy is rare. (C) 2002 American Institute of Physics.