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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1078600
645 <June 01(Tue.)>Frustration-induced Athermal Behaviors: Hilbert Space Fragmentation and Quantum Many-Body Scars 2021.05.24 43287
644 <May 12(Wed.)> Nanomechanical oscillators for quantum technology 2021.05.06 23341
643 <May 04(Tue.)>Flat bands and the geometry of Bloch wave function 2021.04.27 74929
642 <April 28(Wed.)> 손에 잡히는 AI 2021.04.21 10674
641 <April 21(Wed.)> 우주배경복사 편광 관측 - 남극점 기지 바이셉/켁 어레이(BICEP/Keck Array) 망원경 2021.04.12 10142
640 <April 7(Wed.)> Mid-scale facilities for condensed matter research: high magnetic field and neutron scattering 2021.03.31 143673
639 <Mar.31(Wed.)> Nonlinear nanophotonics using on-chip microring resonator 2021.03.25 42775
638 <Mar.24(Wed.)> A tale of quantum magnets 2021.03.18 54871
637 <Mar.17(Wed.)> Glue spectrum for superconductivity obtained via optical spectroscopy 2021.03.10 28483
636 <Mar.10(Wed.)> Dark matter searches in neutrino detectors 2021.03.04 50242
635 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 343558
634 <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 177926
633 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 99541
632 2021학년도 1학기 콜로퀴움 일정 2021.01.13 141843
631 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 235305
630 <Dec.9(Wed.)>한국형 암흑물질 실험 2020.12.02 15676
629 <Dec.2(Wed.)>The era of gravitational waves, and the science that makes it possible 2020.11.25 40362
628 <Nov.18(Wed.)>When Physics meets the Living Cells 2020.11.11 93711
627 <Nov.11(Wed.)>Nonlinear optics to study charge, spin, and crystalline structures 2020.11.04 30959
626 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 76131