Long range ordering of 71° domain walls in epitaxial BiFeO3 thin films

ABSTRACTThe dielectric response of La- and Dy- doped BiFeO3 thin films to electric- and magnetic fields was measured at microwave frequencies (up to 12GHz) in a temperature range from 25 °C to 300 °C. Interesting phenomena were observed. Significant oscillations in the C(f) characteristic which were unaffected by the electric field or by elevated temperature but which were dampened by a magnetic field. We also observed ‘N’-type I-V characteristics. A possible explanation for this mesoscopic response is the presence of structural features that cause resonance (e.g. grains, grain-boundaries, domains, domain walls etc), with a contribution strong enough to be averaged by the system. The exact origin of these features is unknown at present.

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Large Magnetic Anisotropy in Co3Pt Ordered Phase Thin Films

MRS Proceedings ◽

10.1557/proc-517-299 ◽

1998 ◽

Vol 517 ◽

Cited By ~ 5

Author(s):

Yoshiyasu Yamada ◽

Takao Suzuki

Keyword(s):

Thin Films ◽

Activation Energy ◽

Magnetic Anisotropy ◽

Long Range ◽

Deposition Temperature ◽

Short Range ◽

Room Temperature ◽

Perpendicular Magnetic Anisotropy ◽

Fept Alloy ◽

Long Range Ordering

AbstractThe very large perpendicular magnetic anisotropy of the order of 2 x 107 erg/cm3 at room temperature was found in CoJ-x Ptx(0<x<0.5) alloy thin films made by e-beam evaporation. The large magnetic anisotropy is likely related to the anisotropic Co-Co bonding distribution, which is similar to the cases of Co/Pt multilayers and FePt alloy thin films. The activation energy estimated for the ordering is approximately 0.3 eV, which is preferably compared to 0.2 eV for FePt. A model is proposed, for which both a short range and long range ordering are present, depending on substrate deposition temperature.

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Controlled manipulation of conductive ferroelectric domain walls and nanoscale domains in BiFeO3 thin films

Journal of Materiomics ◽

10.1016/j.jmat.2021.10.003 ◽

2021 ◽

Author(s):

Dongfeng Zheng ◽

Guo Tian ◽

Yadong Wang ◽

Wenda Yang ◽

Luyong Zhang ◽

...

Keyword(s):

Thin Films ◽

Domain Walls ◽

Ferroelectric Domain ◽

Bifeo3 Thin Films

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Transmission Electron Microscopy Study of Ferroelectric Domain Walls in BiFeO3 Thin Films: Structures and Switching Dynamics

Domain Walls ◽

10.1093/oso/9780198862499.003.0010 ◽

2020 ◽

pp. 217-244

Author(s):

L. Li ◽

X. Pan

Keyword(s):

Electron Microscopy ◽

Thin Films ◽

Transmission Electron Microscopy ◽

Domain Walls ◽

Dynamic Properties ◽

Microscopy Study ◽

Electron Microscopy Study ◽

Ferroelectric Materials ◽

Bifeo3 Thin Films ◽

Transmission Electron

This chapter presents a review on the recent progress in transmission electron microscopy (TEM) studies of ferroelectric DWs in one of the most widely studied ferroelectric systems — BiFeO3 thin films. This system has been chosen representative for a much wider range of ferroelectric perovskites with functional DWs, due to its strong spontaneous polarization, coexistence of ferroelectricity, ferroelasticity and antiferromagnetism, and numerous functionalities at the DWs. Here, the chapter first briefly introduces the instrumentation, experimental procedures, imaging mechanisms, and analytical methods of the state-of-the-art TEM-based techniques. The application of these techniques to the study of DW structures and switching behaviors is demonstrated, with particular emphasis on the critical roles of interfaces and defects, and interplay between different types of DWs. The phenomena and mechanism discovered in the model system of BiFeO3 are also applicable to many other ferroelectric materials with similar DW structures. The results not only advance the fundamental understanding of static and dynamic properties of ferroelectric DWs, but also form the basis for designing of practical ferroelectric-DW-based devices.

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Introduction of charged domain walls into BiFeO3 thin films using a pit-patterned SrTiO3 (001) substrate

Japanese Journal of Applied Physics ◽

10.7567/1347-4065/ab3897 ◽

2019 ◽

Vol 58 (SL) ◽

pp. SLLB02

Author(s):

Seiji Nakashima ◽

Satoshi Kimura ◽

Yuta Kurokawa ◽

Hironori Fujisawa ◽

Masaru Shimizu

Keyword(s):

Thin Films ◽

Domain Walls ◽

Bifeo3 Thin Films

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Unveiling the pinning behavior of charged domain walls in BiFeO3 thin films via vacancy defects

Acta Materialia ◽

10.1016/j.actamat.2019.12.041 ◽

2020 ◽

Vol 186 ◽

pp. 68-76 ◽

Cited By ~ 3

Author(s):

W.R. Geng ◽

X.H. Tian ◽

Y.X. Jiang ◽

Y.L. Zhu ◽

Y.L. Tang ◽

...

Keyword(s):

Thin Films ◽

Domain Walls ◽

Vacancy Defects ◽

Bifeo3 Thin Films

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The Role of Liquid Crystalline Side Chains for Long-range Ordering in the Block Copolymer Thin Films

Journal of Photopolymer Science and Technology ◽

10.2494/photopolymer.33.529 ◽

2020 ◽

Vol 33 (5) ◽

pp. 529-536

Author(s):

Lei Dong ◽

Alvin Chandra ◽

Kevin Wylie ◽

Ryuichi Nakatani ◽

Yuta Nabae ◽

...

Keyword(s):

Thin Films ◽

Block Copolymer ◽

Long Range ◽

Liquid Crystalline ◽

Side Chains ◽

Long Range Ordering

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Structures and electronic properties of domain walls in BiFeO3 thin films

National Science Review ◽

10.1093/nsr/nwz101 ◽

2019 ◽

Vol 6 (4) ◽

pp. 669-683 ◽

Cited By ~ 2

Author(s):

Huaixun Huyan ◽

Linze Li ◽

Christopher Addiego ◽

Wenpei Gao ◽

Xiaoqing Pan

Keyword(s):

Thin Films ◽

Electric Fields ◽

Domain Walls ◽

Essential Element ◽

Atomic Scale ◽

Photovoltaic Properties ◽

Bifeo3 Thin Films ◽

Physical Volume ◽

Structures And Properties ◽

Fundamental Understanding

Abstract Domain walls (DWs) in ferroelectrics are atomically sharp and can be created, erased, and reconfigured within the same physical volume of ferroelectric matrix by external electric fields. They possess a myriad of novel properties and functionalities that are absent in the bulk of the domains, and thus could become an essential element in next-generation nanodevices based on ferroelectrics. The knowledge about the structure and properties of ferroelectric DWs not only advances the fundamental understanding of ferroelectrics, but also provides guidance for the design of ferroelectric-based devices. In this article, we provide a review of structures and properties of DWs in one of the most widely studied ferroelectric systems, BiFeO3 thin films. We correlate their conductivity and photovoltaic properties to the atomic-scale structure and dynamic behaviors of DWs.

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Extraordinary boundary morphologies of large-scale ordered domains of spheres in thin films of a narrowly dispersed diblock copolymer via thermodynamic control

Nanoscale ◽

10.1039/c5nr03837e ◽

2015 ◽

Vol 7 (42) ◽

pp. 17756-17763 ◽

Cited By ~ 3

Author(s):

Ling-Ying Shi ◽

Hang Li ◽

Wei-Wei Lei ◽

Wei Ni ◽

Rong Ran ◽

...

Keyword(s):

Thin Films ◽

Long Range ◽

Diblock Copolymer ◽

Large Scale ◽

Thermodynamic Control ◽

Specific Potential ◽

Long Range Ordering

Long-range ordering of BCC spheres and extraordinary morphologies at boundaries of adjacent orderly oriented domains observed in BCP thin films via thermodynamical control may have specific potential in nanotechnology.

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