Characteristics of 360°-domain walls observed by magnetic force microscope in exchange-biased NiFe films
Characteristics of 360°-domain walls observed by magnetic force microscope in exchange-biased NiFe films
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磁力显微镜观察交换偏置NiFe薄膜的360°畴壁特征
DOI：
10.1063/1.369110
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发表时间：
1999
影响因子：
3.2
通讯作者：
H. Fujiwara
中科院分区：
文献类型：
--
作者：
H. Cho;C. Hou;M. Sun;H. Fujiwara
用磁力显微镜(MFM)研究了玻璃/Ta(10 Nm)/NiFe(7.2 nm)/FeMn(8.0 nm)Ta(5 Nm)中360°磁畴壁的特性。用射频磁控溅射法制备了样品，并用振动样品磁强计对样品进行了表征。360°域壁既有闭合型，也有线型。闭合型(环状)壁包括圆形、椭圆形和不规则形状的磁区壁，其长轴一般垂直于交换偏置NiFe薄膜的整体易化方向(钉扎方向)。360°壁环也按手性分类。在缺陷附近观察到了大量的360°磁畴壁，壁厚范围为1.5~3μm，并用简化的磁力显微镜成像过程模型进行了模拟验证。360°壁环的形成似乎源于交换偏置薄膜中磁化强度的旋转性质，这种旋转性质来自于交换偏置薄膜中磁化强度的分布.
The characteristics of 360° domain walls have been investigated by magnetic force microscopy (MFM) in glass/Ta(10 nm)/NiFe(7.2 nm)/FeMn(8.0 nm)Ta(5 nm). The sample was prepared by radio-frequency-magnetron sputtering and characterized with a vibrating sample magnetometer. Both closed and line types of 360° domain walls were observed. The closed type (loop) walls include circular, ellipsoidal, and irregular shapes of domain wall, the long axis of which is generally perpendicular to the overall easy direction (pinned direction) of the exchange biased NiFe film. 360° wall loops were also classified by their chirality. Many 360° domain walls were observed near defects and the measured wall thickness ranged from 1.5 to 3 μm. The magnetic structure of the 360° loop was verified by simulations using a simplified model of the MFM imaging process. The formation of a 360° wall loops appears to originate from the rotational nature of the magnetization in the exchange-biased film, which comes from the distribution of...