Control of exotic domain structures in ferroelectric nanopillars by an electric field = 전기장을 이용한 강유전체 나노기둥에서의 특이 도메인 구조 조정에 대한 연구

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Nanoscale ferroic materials have attracted considerable interest due to their novel properties including electronic, electromechanical and magnetoelectric properties different from bulk properties. Until now, exotic ferroelectric structures have been described theoretically such as flux-closure domains, but experimental studies for ferroelectric multi-domains in nanostructures have been a lack of research due to their large domain wall energy. Our experiments can be divided into two major sections. First, we explored ferroelectric nanopillars under strain relaxation. In the as-grown state, there are four classes of domain structures. Each domain structure is switchable to other domain types by tip-based non-local switching methods whereby local electric polarization switching can affect distant domain regions to minimize free energy. Second, we report growth of ferromagnetic nanopillars on (001)-, (110)-, (111)-oriented $SrTiO_3$ (STO) substrates. Our results show that CFO nanopillars are of rectangular, stripe, triangular shapes embedded in BFO matrixes on (001)-, (110)-, (111)-oriented STO substrates, respectively. Moreover, we observe that the size of CFO nanopillars depends on growth temperature and laser repetition rate. Our findings provide a useful insight into ferroelectric nano-scale multi-domain structures.
Advisors
Yang, Chan-Horesearcher양찬호researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 2016.8,[iv, 40 p. :]

Keywords

ferroelectric nanopillar▼aferromagnetic nanopillar▼apiezoresponse force microscopy▼aBiFeO3-CoFe2O4; 강유전체 나노기둥▼a압전 힘 현미경

URI
http://hdl.handle.net/10203/266097
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=849872&flag=dissertation
Appears in Collection
PH-Theses_Master(석사논문)
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