Off-axis electron holographic mapping of magnetic domains in Nd2Fe14B
Off-axis electron holographic mapping of magnetic domains in Nd2Fe14B
复制标题
Nd2Fe14B 磁畴的离轴电子全息图
DOI：
10.1063/1.367916
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发表时间：
1998
影响因子：
3.2
通讯作者：
Yimei Zhu
中科院分区：
文献类型：
--
作者：
M. McCartney;Yimei Zhu
采用无场洛仑兹透镜的离轴电子全息术已被用来提供具有纳米级分辨率和高信噪比的Nd2Fe 14 B中的磁感应直接成像。使用这种技术，重建的相位图像已被用于测量烧结样品中的90°和180°壁的畴壁宽度被测量为分别不大于7和9 nm。感应图显示了热压样品中不寻常的90°畴阵列，在畴的交叉点处具有奇点。原位热退火的热压样品导致磁化旋转伴随着畴壁运动和钉扎在结构缺陷的证据。将样品加热到400 °C以上导致小颗粒在薄区域中的积累和磁对比度的降低。
Off-axis electron holography employing a field-free Lorentz lens has been used to provide direct imaging of magnetic induction in Nd2Fe14B with nanometer-scale resolution and high signal-to-noise. Using this technique, reconstructed phase images have been used to measure domain wall widths for 90° and 180° walls in a sintered sample were measured to be no greater than 7 and 9 nm, respectively. Induction maps show an unusual array of 90° domains in a hot-press sample, with singularities at the intersections of the domains. In situ thermal annealing of the hot-pressed sample resulted in magnetization rotation accompanied by domain wall movement and evidence for pinning at a structural defect. Heating of the sample above 400 °C resulted in the accumulation of small particles in thin regions and decrease in magnetic contrast.
透射电子显微镜
DOI：
10.1007/978-3-319-26651-0_3
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Burke M
通讯作者：
Burke M