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Ferroelectric materials with domains being the basic microstructures, have been investigated for about 100 years. With the development of the material fabrication method and the characterization technique, the important influence of domain configuration on the physical properties of ferroelectrics becomes more and more prominent. Recent researches even reveal that the domains and domain walls can act as individual functional units of micro-nano electronic devices, possessing wide potentials in the areas of information storage, energy transformation, electro-mechanical drive, quantum computation, etc. In this paper, starting from group theory analysis of domain structures, we introduce first the formation and the structures of ferroelectric domains, and then the macroscopic mechanical spectra as well as the electrical properties of the ferroelectric materials. Finally, the recent research progress of polarization switching and domain characterization by piezoresponse force microscopy are also reviewed.
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Keywords:
- ferroelectric materials /
- domain structure /
- switching phenomena /
- internal friction
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图 1 SBT中五种不同的畴组态示意图[10] (a) 原始极化态; (b) 反相畴; (c) 180°畴; (d) 90°畴; (e) 180°反相畴; (f) 90°反相畴
Figure 1. Schematic domain configurations in SBT[10]: (a) Original; (b) the translational domain pair; (c) the 180° (rotational) domain pair; (d) the 90° domain pair; (e) the translational –180° domain pair; (f) the translational –90° domain pair.
图 2 TEM下SBT中的电畴结构[4,11] (a), (b) 不同时间相同衍射条件的TEM暗场像; (c), (d) 标出了(a), (b)图中各畴区的极化方向; 红线、蓝线、黑线分别表示反相畴、180°畴界、90°畴界
Figure 2. TEM observation of the domain structure in SBT[4,11]: (a), (b) TEM dark field images at different time; (c) and (d) the depicted domain patterns of panels (a) and (b) respectively, with arrows showing the polarization directions. The red, blue and black lines are the antiphase boundary, 180o domain wall and 90° domain wall in SBT, respectively.
图 4 BLT薄膜的应力效应[28,31,32] (a)不同晶粒尺寸薄膜中张应力(正值)和压应力(负值)对剩余极化的影响; (b)应力对疲劳特性的影响; (c)应力下电畴重新取向示意图; (d)张应力诱导电畴取向的PFM原位观察
Figure 4. Stress effect in BLT films[28,31,32]: (a) Normalized remnant polarization with stress for films with different grain sizes; (b) fatigue properties under stress; (c) schematic diagram of stress-induced-polarization-reorientation; (d) in-situ PFM observation of stress-induced-polarization-reorientation.
图 6 LN晶体中的电畴生长[39,42] (a)点状畴的半径衰减过程; (b)临界稳定半径与晶片厚度的关系; (c)两种方向条形畴的PFM相位; (d)宽度及不规则度随扫描电压的变化
Figure 6. Domain growth in LN crystals[39,42]: (a) Decay process of domains with various initial radii; (b) critical initial domain radius as a function of sample thickness; (c) PFM phase images of linear domains along different directions; (d) poling voltage dependence of domain width and irregularity of linear domains.
图 7 LN晶体中的极化弛豫[52], 80 V极性扫描后(a) 17 min以及(b) 68 min的PFM相位图; (c)最终稳定翻转畴面积比例随极化电压的变化; (d)回转畴成核时间和生长维度随极化电压的变化
Figure 7. Polarization relaxation in LN single crystals[52]: PFM phase images in (a) 17 min and (b) 68 min after poling with 80 V; (c) final fraction of switched domains with poling voltage; (d) nucleation time and dimension of domain growth with voltage.
图 8 LN晶体中的电畴异常翻转[57] (a)不同定点脉冲电压条件下异常翻转畴区的压电力显微镜图像; (b)异常翻转畴区半径随脉冲电压和时间的变化; (c)翻转畴区的弛豫; (d)异常翻转畴区寿命随脉冲偏压强度和宽度的变化
Figure 8. Abnormally switched domains in LN crystals[57]: (a) Piezoresponse phase images after poling with various pulse voltages; (b) internal radius as a function of pulse magnitude; (c) decay process after poling; (d) lifetime of internal domains with poling conditions.
图 10 BFO薄膜中的畴壁电导[85] (a) c-AFM图像和畴结构示意图; (b)模拟模型示意图和针尖-样品势垒对电流的影响; (c)模拟电势和电流图像
Figure 10. Conductive domain walls in BFO films[85]: (a) c-AFM image and domain pattern; (b) schematic of domain configuration in the dipole-tunneling model and effect of tip-surface barrier on the simulated current; (c) simulated potential and current images.
图 11 LN晶体中的畴壁电导[86] (a)实验二次谐波图像、c-AFM图像和电流截线图; (b)畴壁粗糙度示意图、粗糙畴壁电流模拟图和截线图
Figure 11. Conductive domain walls in LN crystals[86]: (a) Cross section obtained by 3D Cherenkov second-harmonic-generation microscopy, c-AFM image, and cross section of the c-AFM image; (b) sketches for domain walls with different roughness, simulated current distribution for the rough domain walls, and cross section of the simulated current.
图 12 71° BFO条形畴衬底上LSMO薄膜的(a)电输运各向异性和(b)磁电阻各向异性; 109°条形畴衬底上(c)异质结示意图和(d) LSMO (30 nm)/BFO (30 nm)样品的电输运各向异性[89]
Figure 12. LSMO/BFO heterostructure[89]: Anisotropic (a) transport and (b) magnetoresistance of LSMO/BFO heterostructure with 71° domain structure; (c) Schematics and (d) anisotropic transport of LSMO (30 nm)/BFO (30 nm) heterostructure with 109° domain pattern.
表 1 群G = Pm
$\bar 3$ m对其子群H = P4mm的陪集展开[4,13]Table 1. Decompose G = Pm
$\bar 3$ m into left cosets of subgroup H = P4mm[4,13].序号 畴类型 陪集 陪集中的基本对称操作 1 V[001] H = P4mm 1, 4+[001], 2[001], m[100], m[010], m[110], m[$1\bar 10$] 2 V[100] 3–[$1{\bar 1}1$]H 3–[$1{\bar 1}1$], 4+[010], 2[101], 3+[111], 3–[$\bar 1\bar 11$], 3–[$\bar 1\bar 11$], m[$\bar 1 01$], $\bar 4$–[010] 3 V[010] 2[011]H 2[011], 3–[111], 3+[$\bar 111$], 4–[100], m[$0{\bar 1}1$], $\bar 4$+[100], 3+[$1{\bar 1}1$], 3–[$\bar1{\bar 1}1$] 4 V[$\bar 100$] 2[${\bar 1}01$]H 2[${\bar 1}01$], 3–[${\bar 1}11$], 3+[${\bar 1}{\bar 1}1$], 4–[010], $\bar 4$+[010], m[101], 3–[$1{\bar 1}1$], 3+[111] 5 V[$0{\bar 1}0$] 3+[$1{\bar 1}1$]H 3+[$1{\bar 1}1$], 2[$0{\bar 1}1$], 4+[100], 3–[${\bar 1}{\bar 1}1$], 3–[111], 3+[$\bar 1 11$], m[011] 6 V[$00\bar 1$] 2[110]H 2[110], 2[100], 2[010], 2[$\bar 1 10$], 4+[001], 4–[001], $\bar 1$, m[001] -
[1] Lines M E, Glass A M 2001 Principles and Applications of Ferroelectrics and Related Materials (Oxford: Oxford University Press) pp87–126
[2] Tagantsev A K, Cross L E, Fousek J 2010 Domains in Ferroic Crystals and Thin Films (Springer: New York Dordrecht Heidelberg London) pp11–100
[3] Catalan G, Seidel J, Ramesh R, Scott J F 2012 Rev. Mod. Phys. 84 119Google Scholar
[4] 丁勇 2000 博士学位论文 (南京: 南京大学)
Ding Y 2000 Ph. D. Dissertation (Nanjing: Nanjing University) (in Chinese)
[5] 王仁卉, 郭可信 1990 晶体学中的对称群 (北京: 科学出版社) 第十章
Wang R H, Guo K X 1990 Crystallographic Symmetry Group (Beijing: Science Press) Chap.10 (in Chinese)
[6] Tendeloo V G, Amelinckx S 1974 Acta. Crystallogr. A 30 431Google Scholar
[7] 刘建设 1998 博士后研究工作报告 (南京: 南京大学)
Liu J S 1998 Research Report for Post Doctor (Nanjing: Nanjing University) (in Chinese)
[8] Guymont M 1978 Phys. Rev. B 18 5385Google Scholar
[9] Guymont M, Gratias D, Portier R, Fayard M 1976 Phys. Status Solidi A 38 629Google Scholar
[10] Chen X J, Liu J S, Zhu J S, Wang Y N 2000 J. Phys. Condens. Mater 12 3745Google Scholar
[11] Ding Y, Liu J S, Wang Y N 2000 Appl. Phys. Lett. 76 103Google Scholar
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[13] Zheludev I S 1971 Solid State Phys. 26 429Google Scholar
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