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タイトル
和文: 
英文:Deterministic switching of polarization vortices in compositionally graded ferroelectrics using a mechanical field 
著者
和文: Le Van Lich, BUI TINH QUOC, 島田崇央, 北村隆之, Trong-Giang Nguyen, Van-Hai Dinh.  
英文: Le Van Lich, Tinh Quoc Bui, Takahiro Shimada, Takayuki Kitamura, Trong-Giang Nguyen, Van-Hai Dinh.  
言語 English 
掲載誌/書名
和文: 
英文:Physical Review Applied 
巻, 号, ページ Vol. 11        pp. 054001
出版年月 2019年5月1日 
出版者
和文: 
英文:American Physical Society 
会議名称
和文: 
英文: 
開催地
和文: 
英文: 
公式リンク https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.054001
 
DOI https://doi.org/10.1103/PhysRevApplied.11.054001
アブストラクト Deterministic switching of polarization vortex in ferroelectrics by a uniaxial mechanical load is challenging. Here, we demonstrate, by using phase field simulations and ferroelectric instability analyses, a deterministic switching of polarization vortex in a compositionally graded ferroelectric (cgFE) nanoplate under a compressive stress. The obtained results suggest that the rational distribution of material constituents in the cgFE nanoplate tailors the distributions of electromechanical coupling and total energy densities of the nanoplate, which modifies the stress-induced vortex multiplication and annihilation behaviours, distinguished from that in a homogeneous ferroelectric nanoplate. The switching of polarization vortex by compressive stress is verified through instability analyses for the cgFE nanoplate, which not only confirm when the polarization switching occurs, but also demonstrate how the polarization responses at the onset of the switching. In addition, the effects of various factors on feasibility of stress-induced vortex switching, including material gradient, temperature, and width-height ratio of the cgFE nanoplate, are investigated and summarized in fruitful phase diagrams.

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