초록

Abstract ▼

□ 연구개발 목표 및 내용
○ 최종 목표
1) Our aim of this work is to synthesize the single crystalline freestanding membranes on various non-perovskite substrates using a new sacrificial layer and recover the original bulk properties of the materials after releasing from the substrate clamping.
2) After th

□ 연구개발 목표 및 내용
○ 최종 목표
1) Our aim of this work is to synthesize the single crystalline freestanding membranes on various non-perovskite substrates using a new sacrificial layer and recover the original bulk properties of the materials after releasing from the substrate clamping.
2) After the successful transfer of the freestanding membranes, the material functional properties would be further enhanced by applying the strain and mechanical bending.

○ 전체 내용
High-quality perovskite films will be grown epitaxially on the La_0.7Sr_0.3MnO₃ (LSMO) coated layer on the SrTiO₃ (STO) substrate. The ultrathin freestanding perovskite membranes can be fabricated by dissolving the sacrificial LSMO layer in the solution. The strain on the freestanding will be applied by transferring the desired perovskite membrane to the polyimide polymer substrate and then stress will be applied in the (100) directions for both uniaxial and biaxial strain states.
If the inversion symmetry of the centrosymmetric perovskite like STO is broken, will be considered a good candidate material to realize the original flexoelectric effect. To do so, extremely large strain gradients in ultrathin membranes would be attained by applying the scanning probe microscopy (SPM) tip. Structural, chemical, surface, and electrical, magnetic, transport measurements of the as-grown ultrathin films, transferred freestanding membranes in strain and unstrain states will be performed.

□ 연구개발성과
1) We have successfully prepared various freestanding membranes using new sacrificial SrCuO₂ layers.
2) We have synthesized the ferroelectric freestanding heterojunctions and enhanced the piezoelectric properties. Also, the samples are ready to apply dynamic strain and bending and physical properties will be measured soon.

□ 연구개발성과 활용계획 및 기대 효과
1) This highly tunable strained membrane approach provides a broad opportunity to design and manipulate correlated electron states in perovskite oxides.
2) In this work, a room-temperature multiferroic material is expecting to be realized in the strongly correlated oxides.
3) Flexoelectricity in epitaxial perovskite membranes, where it could enable us in many applications such as flexible sensors, flexoelectric and flexomagnetic actuators, memories, and electronic devices.

(source : 요약문 2p)

목차 Contents

• COVER ... 1
• 요약문 ... 2
• 목차 ... 4
• 1. 연구개발과제의 개요 ... 5
• 2. 연구개발과제의 수행 과정 및 수행 내용 ... 5
• 3. 연구개발과제의 수행 결과 및 목표 달성 정도 ... 10
• 1) 연구수행 결과 ... 10
• 2) 목표 달성 수준 ... 10
• 4. 연구개발성과의 관련 분야에 대한 기여 정도 ... 10
• 5. 연구개발성과 및 활용 계획 ... 11
• 1) 연구성과 ... 11
• 2) 연구성과 활용계획 ... 14
• 6. 참고문헌 ... 14
• End of Page ... 15