Spontaneous polarization in nanosized ferroelectrics and its size dependence

纳米铁电体的自发极化及其尺寸依赖性

• 批准号: 24656214
• 负责人: FUJISAWA Hironori
• 金额: $ 2.66万
• 依托单位: University of Hyogo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656214/
• 关键词: ナノ強誘電体; 自発分極; サイズ効果; 圧電定数; 走査型プローブ顕微鏡; SPM; 基板拘束; サイズ依存性

In order to investigate physical properties of nanosized ferroelectrics, we developed a measurement system based on scanning probe microscopy (SPM), which was capable of detecting electrical charges smaller than 10 fC. By using the SPM system developed, switching charges of lead titanate nanoislands with lateral dimensions of several tens nanometers and heights of several nanometers were successfully measured. The SPM revealed that the switching charge of lead titanate nanoislands was as large as those of thin films. From the size dependence and relationship between spontaneous polarization and piezoelectric coefficient, it was found that the decrease in the spontaneous polarization with the island height was responsible for the decrease in the piezoelectric coefficient.

为了研究纳米铁电体的物理性质，我们开发了一种基于扫描探针显微镜（SPM）的测量系统，该系统能够检测小于10 fC的电荷。利用SPM系统，成功地测量了横向尺寸为几十纳米、高度为几纳米的钛酸铅纳米岛的开关电荷。SPM结果表明，钛酸铅纳米岛的开关电荷与薄膜一样大。从自发极化与压电系数的尺寸依赖性和关系来看，自发极化随岛屿高度的减小是导致压电系数减小的主要原因。

项目成果

Switchable Polarization in a Single PbTiO_3 Nanoisland

单个 PbTiO_3 纳米岛中的可切换偏振

• 发表时间: 2012
• 作者: Hironori Fujisawa;Masahi Igawa;Seiji Nakashima;Masaru Shimizu
• 通讯作者: Masaru Shimizu

原子間力顕微鏡による単一PbTiO_3ナノ島の分極測定

使用原子力显微镜测量单个 PbTiO_3 纳米岛的偏振

• 发表时间: 2012
• 作者: H.Fujisawa;M.Shimizu;R.Kuri;S.Na- kashima;Y.Kotaka and K.Honda;Hironori Fujisawa;Hiroaki Yane;M.Shimizu;小林千晃;C.Kobayashi;M.Shimizu;藤澤浩訓
• 通讯作者: 藤澤浩訓

原子間力顕微鏡による単一PbTiO3ナノ島の分極測定

使用原子力显微镜测量单个 PbTiO3 纳米岛的偏振

• 发表时间: 2012
• 作者: H.Fujisawa;M.Shimizu;R.Kuri;S.Na- kashima;Y.Kotaka and K.Honda;Hironori Fujisawa;Hiroaki Yane;M.Shimizu;小林千晃;C.Kobayashi;M.Shimizu;藤澤浩訓;M.Shimizu;小林千晃;小林千晃;井川将志;藤澤 浩訓
• 通讯作者: 藤澤 浩訓

低次元強誘電体の作製とその物性

低维铁电材料的制备及其物理性能

• 发表时间: 2014
• 作者: 藤沢浩訓;中嶋誠二;清水勝
• 通讯作者: 清水勝

Size Dependence of Spontaneous Polarization in Nanosized Lead Titanate

纳米钛酸铅自发极化的尺寸依赖性

• 发表时间: 2013
• 作者: H. Fujisawa;M. Igawa;S. Nakashima and M. Shimizu
• 通讯作者: S. Nakashima and M. Shimizu