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 2022학년도 1학기 콜로퀴움 일정 2022.01.10 28044
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 973912
100 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 91241
99 <12/21> Special Seminar by Professor Ilya Vekhter 2010.11.30 115939
98 <11/29> Kahler Inflation and WMAP7 data - a top down approach to Cosmology 2010.11.25 88422
97 <11/26> Effective Holographic Theories for Condensed Matter Systems 2010.11.23 86282
96 <11/5> Discussion on recent observation of cosmological dipole of alpha 2010.11.04 118559
95 <10/15> How can population pyramids be used to explore the past? 2010.10.14 98111
94 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 92218
93 <8/17> AdS Black Hole Solutions in Extended New Massive Gravity 2010.08.16 91977
92 <8/4> Remarks on the Scalar Graviton and Consistency of Horava Gravity 2010.07.28 93352
91 <7/21> Next generation cryogenic free 1.5T MgB2-magnet based MRI 2010.07.20 82094
90 <7/28> NQR/NMR study on a single crystal of LiFeAs 2010.07.20 97965
89 <7/9> Strange Metallic Behavior in Anisotropic Background 2010.07.01 113112
88 <6/18> A consistent truncation of D=11 supergravity to D=4, N=2 supergravity using wrapped M5-branes 2010.06.10 85185
87 <5/26>BK21 물리연구단 석학초빙 특별 세미나 2010.05.17 126192
86 <4/27> Organic-based Magnet and Organic-based spintronics : New science and Technologies 2010.04.22 92347
85 <4/2> Supersymmetric vacua of mass-deformed M2-brane theory 2010.03.29 83072
84 <2/16>Development of Micromegas detectors for neutron physics 2010.02.01 92986
83 <2/1> The Surface Science of Adsorption on Crystalline Ferroelectric Polymer Surfaces 2010.01.25 87911
82 <1/28> Steps towards a non-relativistic AdS/CFT 2010.01.25 101195
81 <12/19> The BLG Theory in Light-Cone Superspace 2009.12.15 87244