Hysteresis, d*33 and d33 of Fe81.6Ga18.4 textured polycrystals
Hysteresis, d*33 and d33 of Fe81.6Ga18.4 textured polycrystals
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DOI：
10.1063/1.3554252
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发表时间：
2011-03
影响因子：
3.2
通讯作者：
J. Restorff;M. Wun-Fogle;E. Summers
中科院分区：
文献类型：
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作者：
J. Restorff;M. Wun-Fogle;E. Summers
在三个Fe81.6Ga18.4（Galfenol）高度织构化的多晶棒上进行d33*（主环和次环）和d33（主环）的测量，其中一个棒具有少量的1002钢代替铁。在100 Oe时，在±25和± 0.5 MPa之间的7个ΔT用于小回路。这些测量对于能量收集是有用的，能量收集是通过利用环境中存在的振动来产生能量。对于磁致伸缩材料，d33*= B/H是相关参数，其中B是磁通量密度，T是应力，H保持恒定。由于真实的能量收集装置将不具有主动H控制，因此在H未保持恒定的情况下也测量了Δ B/Δ T。ΔT ≥ ±5 MPa的两个二元样品的d33* 和d33（d33= Δ S/Δ HT）通过高斯加常数很好地拟合。d33和d33* 的峰值振幅分别为1080和1060 nm/A。在较小的ΔT下，d33* 与T的关系是平坦的或显示出宽峰。含钢试样具有较大的立方各向异性。
Measurements of d33* (major and minor loops) and d33 (major loops) were made on three Fe81.6Ga18.4 (Galfenol) highly textured polycrystalline rods, one of which had a small amount of 1002 steel substituted for the iron. Seven ΔT’s between ±25 and ± 0.5 MPa at 100 Oe were used for the minor loops. These measurements are useful for energy harvesting, which is the generation of energy by utilizing vibrations present in the environment. For magnetostrictive materials d33*=∂B/∂THis the relevant parameter, where B is the magnetic flux density, T is the stress and H is held constant. Since real energy harvesting devices will not have active H control, ∂B/∂Twas also measured where H was not held constant. The d33*’s and d33’s (d33=∂S/∂HT) for both binary samples with ΔT ≥ ±5 MPa were well fit by a Gaussian plus a constant. Peak amplitudes for d33 and d33*were ∼80 and ∼60 nm/A, respectively. At smaller ΔT’s, d33*vs. T was flat or showed a broad peak. The steel containing sample had a larger cubic anisotropy which ...