Evolution of the phase structure, magnetic domain structure, and magnetic properties of annealed Fe72Ga28 thin films
Evolution of the phase structure, magnetic domain structure, and magnetic properties of annealed Fe72Ga28 thin films
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DOI：
10.1016/j.jallcom.2021.162306
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Hongyu Yi;Jiheng Li;Haijun Yu;Fan Li;X. Bao;Xuexu Gao
中科院分区：
文献类型：
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作者：
Hongyu Yi;Jiheng Li;Haijun Yu;Fan Li;X. Bao;Xuexu Gao
与无序的体心立方（bcc）A2相相比，有序的面心立方（fcc）L12相表现出负磁致伸缩（λ）并具有高弹性模量（E）。因此，深入了解Fe-Ga薄膜从bcc结构的A2相到fcc结构的L12相的微观结构演变过程，对于获得具有良好性能的Fe-Ga薄膜具有重要意义。分析了Fe 72 Ga 28薄膜的相结构、磁畴结构和磁性能的变化。高分辨透射电镜（HRTEM）和掠入射X射线衍射（GI-XRD）分析表明，Fe 72 Ga 28薄膜在热处理后发生了由A2到A2 L12的相变。几何相分析（GPA）和电子背散射检测（EBSD）结果表明，在A2和L12的相界处也观察到了非连续的晶格畸变。高分辨透射电子显微镜（HRTEM）观察到相界存在大量刃位错。通过磁力显微镜（MFM）检测到磁畴结构从迷宫状畴向迷宫状畴和蜂窝状畴的转变。磁性能的变化被确定为与A2和L12的相界之间的结构转变和不均匀的晶格畸变有关。
In contrast to the disordered body-centered cubic (bcc) A2 phase, the ordered face-centered cubic (fcc) L12phase exhibits negative magnetostriction (λ) and has a high elastic modulus (E). Therefore, an in-depth understanding of the microstructural evolution of Fe–Ga thin films from bcc A2 phase to fcc L12phase is essential to obtain Fe–Ga thin films with desirable properties. The transformation of the phase structure, magnetic domain structure, and magnetic properties of Fe72Ga28thin films is analyzed in this study. The phase transformation of the Fe72Ga28thin film from A2 to A2 L12occurred after heat treatment, as determined by high-resolution transmission electron microscopy (HRTEM) and glancing-incidence X-ray diffraction (GI-XRD). Non-continuous lattice distortion at the phase boundaries of A2 and L12was also observed, as shown by geometric phase analysis (GPA) and electron backscattered scattering detection (EBSD). Numerous edge dislocations at the phase boundaries were revealed by HRTEM. A shift in the magnetic domain structure from the maze-like domain to maze-like domain and honeycomb-like domain was detected by magnetic force microscopy (MFM). The variation in magnetic properties was determined to be related to the structural transformation and ununiform lattice distortion between the phase boundaries of the A2 and L12.