嵌入软磁基体中的条形结构的洛伦兹TEM成像
Lorentz TEM imaging of stripe structures embedded in a soft magnetic matrix
摘要：
采用高分辨洛伦兹透射电镜成像技术研究了NiFe/NiFeGa混合条形软磁结构中NiFe薄膜的Néel壁。在1000 nm宽的相邻的未照射的照射条纹的磁化的反平行取向观察到通过形成高角度畴壁在磁化反转。在将条带结构尺寸从1000 nm缩小到200 nm时，观察到外部磁场反转从离散畴图案到有效磁介质的过渡。这种转变与相邻条纹之间承载高角度畴壁的能力消失有关。研究还表明，洛伦兹显微镜的潜力，以及在微米尺度下的周期性条纹结构的图像。
英文摘要：
Néel walls in soft magnetic NiFe/NiFeGa hybrid stripe structures surrounded by a NiFe film are investigated by high resolution Lorentz transmission electron microscopic imaging. An anti-parallel orientation of magnetization in 1000 nm wide neighboring unirradiated-irradiated stripes is observed by forming high angle domain walls during magnetization reversal. Upon downscaling the stripe structure size from 1000 nm to 200 nm a transition from a discrete domain pattern to an effective magnetic medium is observed for external magnetic field reversal. This transition is associated with vanishing ability of hosting high angle domain walls between adjacent stripes. The investigation also demonstrated the potentiality of Lorentz microscopy to image periodic stripe structures well under micron length-scale.
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