logo

korean english

게시판

Home > 게시판 > 세미나

다음과 같이 세미나 모임을 개최합니다. 많은 참석 부탁합니다. 


날짜: 2015/ 6/2 (화)

장소: 삼성 학술 정보관 2 스터디룸 2F-6


연사: 박  수  현  박사님 (서울대학교 IBS 강상관계물질연구단)

제목: Helical magnetic order in Fe nanoislands

초록: Magnetic interfaces show intriguing phenomena, such as exchange bias, tuning of magnetic
anisotropy, and spin information transfer. However, low-dimensionality in magnetic materials,
as compared to their bulk counterparts, often leads to unconventional magnetic behaviors such
as non-collinear spin orders[1]. Elaborate studies on nanoscale magnets, thus, are required to
utilize the magnetic nanocontacts for envisioned applications to future spin transport device and
data-storage. We employ spin-polarized scanning tunneling microscopy and spectroscopy (SPSTM/
S) to achieve a microscopic access to the local magnetic properties in individual
nanostructures.
In this talk, I present SP-STM/S studies on nanostructures of bilayer Fe[1], Co[2], and their spin
interfaces on Cu(111)[3,4], with control and quantitative characterization of magnetic states of
tips[5]. First, Fe nanoisland shows a magnetic stripe phase with a period of 1.28 nm (Fig. 1), which
is identified as a one-dimensional helical spin order.[1] Ab initio calculations identify reduceddimensionality-
enhanced competing exchange interactions as the driving force of this spin order.
Second, SP-STM/S of Co in a circumferential contact with Fe[3] (Fig. 2) reveals interfacial
variations of magnetic orders of both sides, concurrent with a switching between two distinct
bound phases of Fe helical spin order by bistable Co ferromagnetic (FM) states.[4] Spin
polarization mapping provides an atomic scale spatial spin distribution in proximity of the Co-Fe
contact, which may unravel the magnetic coupling responsible for the interfacial magnetic order.



번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 585443
632 2021학년도 1학기 콜로퀴움 일정 2021.01.13 215
631 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 234
630 <Dec.9(Wed.)>한국형 암흑물질 실험 2020.12.02 916
629 <Dec.2(Wed.)>The era of gravitational waves, and the science that makes it possible 2020.11.25 1168
628 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 1705
627 <Nov.18(Wed.)>When Physics meets the Living Cells 2020.11.11 1745
626 <Oct.14(Wed.)>New Ways to Search for the Dark World 2020.10.12 1776
625 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 2111
624 <Sep.23(Wed.)>나는 내 마음이야 2020.09.16 2199
623 <Oct.28(Wed.)> Physics of Global Warming 2020.10.22 2213
622 <Nov.11(Wed.)>Nonlinear optics to study charge, spin, and crystalline structures 2020.11.04 2492
621 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 3127
620 <Sep.16(Wed.)>Artificial Crystal 2020.09.14 3274
619 <Oct.7(Wed.)>Organic Photodiode for Image Sensor 2020.09.24 4831
618 <Dec.11(Wed.)>데이터 과학으로서의 물리학. 그리고 금융투자업 2019.12.04 15801
617 <12/10(Tue.)> Investigating dark matter signals at neutrino telescopes 2019.12.06 17451
616 <2/17(Mon.)> Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry 2020.02.11 17633
615 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 17859
614 <12/6(Fri.)>topological phase transitions in Kitaev quantum spin liquids. 2019.12.04 18232
613 <Nov.13(Wed.)>The Science of Quark-Gluon Plasma 2019.11.06 19676