SEM observation of the domain structure

域结构的SEM观察

• 批准号: 09640407
• 负责人: ABE Kiyoshi
• 金额: $ 2.05万
• 依托单位: Teikyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640407/
• 关键词: SC (NH_2) _2; K_2ZnCl_4; NaNO_2; domain sturacture; etching; SEM; cold stage; secondary electron eficency; K_2ZmCl_4; N_aNO_2; 強誘導体; 分域構造; 亜硝酸ナトリウム; チオ尿素; TGS; ジュールートムソン効果

1 We thought the reason why a SEM observation of ferroelectric domain structure induces the disappearance of the contrast is the occurance of polarization reversal caused by the charging effect of specimen. Then we attempted to observe domain structure by SEM at low temperature where the coercive field becomes strong, and examined the decrease of the polarization reversal caused by charging. The following is this result. The cause was not occurrence of a polarization reversal, but was the difference of the secondary electron efficiency in positive and negative domains. This fact suggest that if we want to observe ferroelctric domain patterns by SEM, we must change the usage of SEM.2 We succeeded in observing the domain structure in ferroelectric thiourea, SC(NH_2) _2, by a SEM which equipped with cold stage system. The observed domain structure was similar to one in ferroelectric sodium nitrite and the minimum width of the confirmed domain was 0.2 mu m.3 A SEM Observation of etched surface has already been carried out in NaNO_2, We applied this technique to K_2ZnCl_4 to examine the process of domain patterns coarsening. We found that acetone is excellent etchant of this sample and the resolving power of this etching is still a micron order at present. If the resolving power is improved a little we can use a SEM to observation and examine the initial process of domain pattern coasening.

1我们认为，对铁电域结构的SEM观察的原因引起了对比的消失，这是由于样品的充电效应引起的极化逆转的发生。然后，我们试图在低温下通过SEM观察域结构，在低温下，强制场变得强大，并检查了由充电引起的极化逆转的减小。以下是此结果。原因不是发生极化逆转的发生，而是正和负域中二级电子效率的差异。这一事实表明，如果我们想通过SEM观察铁铁域模式，我们必须更改SEM的用法。2我们成功地观察了配备有冷级系统的SEM，SEM可以通过SEM观察到铁电硫库（NH_2）_2中的域结构。观察到的结构域结构与亚硝酸钠中的一个类似于一个结构，确认结构域的最小宽度为0.2 MU m.3 M.3已经在Nano_2中进行了对蚀刻表面的观察，我们将此技术应用于K_2ZNCL_4，以检查K_2ZNCL_4以固定的域模式。我们发现，丙酮是该样品的极好的善变，目前，这种蚀刻的能力仍然是微米的秩序。如果分辨能力得到改善，我们可以使用SEM观察并检查域模式坐骑的初始过程。

项目成果

Katsumi HAMANO et al.: "SEM Observation of Ferroelectric Domain Pattern of Sodium Nitrite Delineated by Etching" Journal of the Physical Society of Japan. 67・10. 3651-3652 (1998)

Katsumi HAMANO 等：“通过蚀刻描绘的亚硝酸钠铁电畴图案的 SEM 观察”日本物理学会杂志 67・10（1998 年）。

Katsumi HAMANO,Kiyoshi ABE and Toshiharu MITSUI: "SEM Observation of Ferroelectric Domain Pattern of Sodium Nitrite Delineated by Etching" Journal of the Physical Society of Japan. Vol.67. 3651-3652 (1998)

Katsumi HAMANO、Kiyoshi ABE 和 Toshiharu MITSUI：“通过蚀刻描绘的亚硝酸钠铁电畴图案的 SEM 观察”日本物理学会杂志。