Magnetostriction and Magnetic Microscopy Studies in Fe-Co-Si-B Thin Films
Magnetostriction and Magnetic Microscopy Studies in Fe-Co-Si-B Thin Films
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DOI：
10.1088/2053-1591/aab275
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发表时间：
2018-03-01
影响因子：
2.3
通讯作者：
Jayalakshmi, V
中科院分区：
文献类型：
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作者：
Umadevi, K.;Chelvane, J. Arout;Jayalakshmi, V
本文研究了基片温度对溅射FeCo-Si-B薄膜磁致伸缩特性的影响。通过测量薄膜悬臂梁中的尖端偏转进行的磁致伸缩测量被发现随着衬底温度的增加而增加。为了了解磁致伸缩随衬底温度的变化，进行了详细的结构，微观结构，磁化和域成像研究。磁化强度的研究表明存在强的面内磁各向异性的所有电影。面内矫顽力随衬底温度升高的变化与晶粒尺寸和表面粗糙度效应有关。角度依赖的磁滞和域成像研究进行了纵向磁光克尔显微镜显示存在较强的平面内单轴各向异性的沉积膜。当衬底温度升高时，由于结晶增强和应力松弛，面内各向异性性质逐渐向各向同性性质变化。沿面内易磁化轴和难磁化轴的磁化反转沿着分别由畴壁运动和相干旋转、畴壁运动和旋转共同作用决定。磁致伸缩随衬底温度的增加与结晶、晶粒尺寸和磁各向异性之间的强烈相互作用有关。
This paper reports the effect of substrate temperature on the magnetostrictive behavior of sputtered FeCo-Si-Bthin films. Magnetostriction measurements carried out by measuring the tip deflection in thin film cantilevers were found to increase with increase in substrate temperatures. To understand the variation of magnetostriction with substrate temperature, detailed structural, microstructural, magnetization and domain imaging studies were carried out. Magnetization studies indicated presence of strong in-planemagnetic anisotropy for all the films. The change in the in-plane coercivity with increase in substrate temperature was correlated with grain size and surface roughness effects. Angular dependent magnetic hysteresis and domain imaging studies carried out using longitudinal Magneto-optic Kerr microscopy displayed presence of strong in-plane uniaxial anisotropy for the as deposited film. Upon increase in substrate temperature, in-plane anisotropic nature was found to gradually change towards isotropic nature owing to the enhancement in crystallization and relaxation of stresses. The magnetization reversal along the in-plane easy axis and hard axis of magnetization was found to be dominated by domain wall motion and through a combination of coherent rotation, domain wall motion&rotation respectively. The increase in the magnetostriction with substrate temperature was correlated with the strong interplay between the crystallization, grain size and magnetic anisotropy.