Stress-coefficient of magnetoelastic anisotropy in flexible Fe, Co and Ni thin films
Stress-coefficient of magnetoelastic anisotropy in flexible Fe, Co and Ni thin films
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DOI：
10.1016/j.jmmm.2020.166750
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发表时间：
2020-07
影响因子：
2.7
通讯作者：
Xiaoyuan Chen;Baomin Wang;Xingcheng Wen;P. Sheng;D. Pravarthana;Huali Yang;Yali Xie;Haigang Liu-Haigang-Li
中科院分区：
文献类型：
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作者：
Xiaoyuan Chen;Baomin Wang;Xingcheng Wen;P. Sheng;D. Pravarthana;Huali Yang;Yali Xie;Haigang Liu-Haigang-Li
磁弹性各向异性是磁各向异性中最本质、最基础的特性之一，在先进柔性磁性器件中具有核心应用和广阔前景。在这里，我们确定了沉积在柔性聚偏二氟乙烯 (PVDF) 基板上的 Fe、Co 和 Ni 薄膜的磁弹性各向异性的应力系数。由于PVDF的热膨胀各向异性，可以有效地产生单轴应力，并通过改变温度将单轴应力原位转移到磁性薄膜上。利用各向异性磁阻（AMR）定量研究了不同压应力下的磁各向异性常数。通过拟合不同压应力下的AMR曲线，确定Fe、Co、Ni薄膜的磁弹性各向异性应力系数分别为(6.31±0.19)× 10 3 erg cm− 3 GPa− 1、(2.71±0.13)× 10 4 erg cm− 3 GPa− 1和(2.46±0.19)× 10 5分别为 erg cm− 3 GPa− 1。这些值是磁性元件的基本磁参数，有助于评估磁性器件在柔性/可拉伸条件下的性能。
Magnetoelastic anisotropy is one of the most essential and fundamental characteristics in the magnetic anisotropy, which holds the core application and broad prospects in advanced flexible magnetic devices. Here, we determined the stress-coefficient of magnetoelastic anisotropy of Fe, Co and Ni thin films deposited on flexible polyvinylidene fluoride (PVDF) substrate. Owing to an anisotropic thermal expansion of PVDF, a uniaxial stress can be effectively generated and transferred to the magnetic films in-situ by changing the temperature. The magnetic anisotropy constants at different compressive stresses were quantitatively investigated with anisotropic magnetoresistance (AMR). Through fitting the AMR curves at different compressive stresses, the stress-coefficient of magnetoelastic anisotropy of Fe, Co and Ni thin films were determined to be (6.31±0.19)× 10 3 erg cm− 3 GPa− 1,(2.71±0.13)× 10 4 erg cm− 3 GPa− 1 and (2.46±0.19)× 10 5 erg cm− 3 GPa− 1, respectively. These values are basic magnetic parameter for magnetic elements, which are helpful for evaluating the performance of magnetic devices under flexible/stretchable conditions.