korean english


Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다. 아 래 제목: Resistance Switching Behavior of Epitaxially Grown NiO Thin Films 연사: 이승란 박사(서울대학교 재료공학부) 일시: 2009년 9월 15일(화) 15:00-17:00 장소: 기초과학연구소 세미나실(31317호) 초록: Resistance switching phenomenon in metal-oxide-metal (MOM) structures has attracted great attention due to its potential applications in nonvolatile resistance random access memory (ReRAM) devices. In addition to many efforts to improve device performance, extensive studies have been devoted to explain the switching mechanism. Among various oxide materials, polycrystalline NiO (poly-NiO) films have been intensively studied owing to the better retention and endurance properties of NiO than other oxide systems. In order to understand resistance switching mechanism of NiO, we have deposited epitaxial NiO (epi-NiO) films on SrRuO3 (SRO) bottom electrodes as a model system. Interestingly, in contrast to the previous reports on unipolar switching behavior of poly-NiO, epi-NiO with Pt and CaRuO3 (CRO) as the TEs shows bipolar switching behavior. However, when reactive metals are employed as TEs such as Al and Ti, epi-NiO does not show successive resistance switching, indicating that the TE/epi-NiO interface plays a key role in bipolar resistance switching of epi-NiO. To understand the conduction properties of TE/epi-NiO, we studied the temperature dependence of the I-V characteristics for various TEs and resistance states. The temperature dependence of the pristine TE/epi-NiO suggests that oxygen ions in an epi-NiO surface migrates and oxidizes the TEs except CRO, resulting in an interfacial oxide layer between the TEs and epi-NiO. Furthermore, after the electroforming process, the temperature dependence of the ON and OFF states exhibits metallic and non-insulating behavior, respectively. From our experimental results, we suggest the interfacial oxide is responsible for the insulating behavior of the pristine state and the role of the electroforming process is to make conducting path in the interfacial oxide to epi-NiO. The details of the switching mechanism of epi-NiO will be discussed further. 22906087062290608706
번호 제목 날짜 조회 수
공지 2021학년도 1학기 콜로퀴움 일정 2021.01.13 13675
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 608569
634 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 164
633 <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 472
632 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 860
631 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 1512
630 <Dec.9(Wed.)>한국형 암흑물질 실험 2020.12.02 2076
629 <Dec.2(Wed.)>The era of gravitational waves, and the science that makes it possible 2020.11.25 2536
628 <Oct.14(Wed.)>New Ways to Search for the Dark World 2020.10.12 2821
627 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 3302
626 <Sep.23(Wed.)>나는 내 마음이야 2020.09.16 3356
625 <Nov.18(Wed.)>When Physics meets the Living Cells 2020.11.11 3582
624 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 3674
623 <Oct.28(Wed.)> Physics of Global Warming 2020.10.22 3686
622 <Nov.11(Wed.)>Nonlinear optics to study charge, spin, and crystalline structures 2020.11.04 4209
621 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 4350
620 <Sep.16(Wed.)>Artificial Crystal 2020.09.14 4867
619 <Oct.7(Wed.)>Organic Photodiode for Image Sensor 2020.09.24 6726
618 <Dec.11(Wed.)>데이터 과학으로서의 물리학. 그리고 금융투자업 2019.12.04 17013
617 <12/10(Tue.)> Investigating dark matter signals at neutrino telescopes 2019.12.06 18832
616 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 19303