نتایج جستجو برای: ferroelectricity

تعداد نتایج: 1253  

2008
Igor A. Kornev Laurent Bellaiche

Advances in first-principles computational approaches have, over the past fifteen years, made possible the investigation of physical properties of ferroelectric systems. In particular, such approaches have led to a microscopic understanding of the occurrence of ferroelectricity in perovskite oxides at ambient pressure. In this paper, we report ab-initio studies on the effect of hydrostatic pres...

Journal: :Nanoscale 2015
Daehee Seol Hiroki Taniguchi Jae-Yeol Hwang Mitsuru Itoh Hyunjung Shin Sung Wng Kim Yunseok Kim

Bismuth silicate (Bi2SiO5) was recently suggested as a potential silicate based lead-free ferroelectric material. Here, we show the existence of ferroelectricity and explore the strong anisotropy of local ferroelectricity using piezoresponse force microscopy (PFM). Domain structures are reconstructed using angle-resolved PFM. Furthermore, piezoresponse hysteresis loops and piezoelectric coeffic...

2016
Jacques Prost R. Bruinsma F. Tournilhac

Recently, it was discovered that a-chiral smectic layers can undergo a phase transition into a polar smectic. The new phase is fundamentally different from that of the existing chiral SmC* ferroelectrics. In this paper we examine the underlying mechanism responsible for the new form of ferroelectricity. A Landau theory is presented to discuss the competition between ferroelectricity and other f...

Journal: :Nature materials 2012
Peter Lunkenheimer Jens Müller Stephan Krohns Florian Schrettle Alois Loidl Benedikt Hartmann Robert Rommel Mariano de Souza Chisa Hotta John A Schlueter Michael Lang

Multiferroics, showing simultaneous ordering of electrical and magnetic degrees of freedom, are remarkable materials as seen from both the academic and technological points of view. A prominent mechanism of multiferroicity is the spin-driven ferroelectricity, often found in frustrated antiferromagnets with helical spin order. There, as for conventional ferroelectrics, the electrical dipoles ari...

Journal: :Physical review letters 2011
H J Xiang E J Kan Y Zhang M-H Whangbo X G Gong

The ferroelectric polarization of triangular-lattice antiferromagnets induced by helical spin-spiral order is not explained by any existing model of magnetic-order-driven ferroelectricity. We resolve this problem by developing a general theory for the ferroelectric polarization induced by spin-spiral order and then by evaluating the coefficients needed to specify the general theory on the basis...

2017
Akira Onodera Masaki Takesada

The origin of ferroelectricity in doped binary crystals, Pb1−xGexTe, Cd1−xZnxTe, Zn1−xLixO, and Hf1−xZrxO2 is discussed, while no binary ferroelectrics have been reported except for two crystals, HCl and HBr. The ferroelectricity is induced only in doped crystals, which shows an importance of electronic modification in chemical bonds by dopants. The phenomenological and microscopic treatments a...

2016
Fucai Liu Lu You Kyle L Seyler Xiaobao Li Peng Yu Junhao Lin Xuewen Wang Jiadong Zhou Hong Wang Haiyong He Sokrates T Pantelides Wu Zhou Pradeep Sharma Xiaodong Xu Pulickel M Ajayan Junling Wang Zheng Liu

Two-dimensional (2D) materials have emerged as promising candidates for various optoelectronic applications based on their diverse electronic properties, ranging from insulating to superconducting. However, cooperative phenomena such as ferroelectricity in the 2D limit have not been well explored. Here, we report room-temperature ferroelectricity in 2D CuInP2S6 (CIPS) with a transition temperat...

Journal: :Nanoscale 2015
Wei Qin Beibei Xu Shenqiang Ren

Multiferroics are materials that simultaneously exhibit more than one ferroic order parameters, such as ferroelectricity, ferroelasticity and ferromagnetism. Recently, multiferroicity has received a significant revival of interest due to the colossal magnetoelectric coupling effect for the development of nano-ferronics. In this mini-review, we focus on a recent study of ferroelectricity, magnet...

Journal: :Science 2016
Kai Chang Junwei Liu Haicheng Lin Na Wang Kun Zhao Anmin Zhang Feng Jin Yong Zhong Xiaopeng Hu Wenhui Duan Qingming Zhang Liang Fu Qi-Kun Xue Xi Chen Shuai-Hua Ji

Stable ferroelectricity with high transition temperature in nanostructures is needed for miniaturizing ferroelectric devices. Here, we report the discovery of the stable in-plane spontaneous polarization in atomic-thick tin telluride (SnTe), down to a 1-unit cell (UC) limit. The ferroelectric transition temperature T(c) of 1-UC SnTe film is greatly enhanced from the bulk value of 98 kelvin and ...

2014
Yao-Wen Yeh Shiyou Xu Nan Yao

Ferroelectric materials, which exhibit switchable polarization and are piezoelectric, have been extensively studied because of their applications in nonvolatile memory and energy harvesting devices.[1,2] Recently, ferroelectric nanostructures have attracted great interest as they provide a platform to investigate the size effect of ferroelectricity and enable integration with prevailing miniatu...

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