logo

korean english

게시판

Home > 게시판 > 세미나

에피 산화물연구실에서 Los Alamos National Laboratory 강경태 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

===========================================================================

Date/time: 2021. 1. 14 (Thu.) 10:00

Speaker:     태 박사님 (Los Alamos National Laboratory)

Title: Oxygen sponge effects for epitaxial manganite thin film design

Abstract: Ever since the development of high-temperature superconducting thin films, pulsed laser deposition (PLD) has played a central role in realizing high-quality complex oxides. In complex oxide thin films, heterostructure, and nanocomposites, the PLD has been widely utilized for various properties such as ferroelectricity, magnetism. Among the PLD parameters, background oxygen gas and oxide target have been known as the primary oxygen sources to determine the oxygen amount within oxides. So, most conventional oxide films are deposited in the relatively high oxygen partial pressure (50~250 mTorr). Meanwhile, some oxide heterostructures require low oxygen partial pressure, and herein the oxygen vacancies are hardly removed due to the entanglement with the cation off-stoichiometry. In turn, it is extensively demanded to develop a parameter of controlling the oxygen content regardless of the growth pressure, by which enough oxygen can be supply to films for full oxidation even in the low oxygen pressure growth.

Here, we propose the oxygen sponge effect's hypothesis in controlling the oxygen content within the films by using the La0.7Sr0.3MnO3 system [1]. The pre-substrate-annealing (PSA) helps the oxide substrate serve as an oxygen sponge, providing an oxygen-rich or oxygen-poor environment for the film growth. During the PSA, the substrate is heated up in a given oxygen partial pressure right before the film deposition. Moreover, depending on the PSA conditions, the remarkable changes in oxygen content, structure, and functionalities in the as-grown oxide films emerge. The substrate oxygen sponge effect, with the large oxygen concentration gradient at high temperatures, can be applied for emergent interfacial phenomena and the growth of functional oxide thin films and nanocomposites.

[1] K. T. Kang et al., Appl. Phys. Lett. 117, 151601 (2020).

 

온라인으로 진행되는 Webniar(Web+Seminar)이며, Webex meetings 프로그램을 통해 진행됩니다.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1009130
642 <April 28(Wed.)> 손에 잡히는 AI 2021.04.21 9266
641 <April 21(Wed.)> 우주배경복사 편광 관측 - 남극점 기지 바이셉/켁 어레이(BICEP/Keck Array) 망원경 2021.04.12 8864
640 <April 7(Wed.)> Mid-scale facilities for condensed matter research: high magnetic field and neutron scattering 2021.03.31 96001
639 <Mar.31(Wed.)> Nonlinear nanophotonics using on-chip microring resonator 2021.03.25 29916
638 <Mar.24(Wed.)> A tale of quantum magnets 2021.03.18 38894
637 <Mar.17(Wed.)> Glue spectrum for superconductivity obtained via optical spectroscopy 2021.03.10 23590
636 <Mar.10(Wed.)> Dark matter searches in neutrino detectors 2021.03.04 37744
635 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 182765
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 98738
633 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 60108
632 2021학년도 1학기 콜로퀴움 일정 2021.01.13 128777
» <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 140048
630 <Dec.9(Wed.)>한국형 암흑물질 실험 2020.12.02 14262
629 <Dec.2(Wed.)>The era of gravitational waves, and the science that makes it possible 2020.11.25 33472
628 <Nov.18(Wed.)>When Physics meets the Living Cells 2020.11.11 62694
627 <Nov.11(Wed.)>Nonlinear optics to study charge, spin, and crystalline structures 2020.11.04 26383
626 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 52341
625 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 66867
624 <Oct.28(Wed.)> Physics of Global Warming 2020.10.22 33909
623 <Oct.14(Wed.)>New Ways to Search for the Dark World 2020.10.12 14711