korean english


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
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 1078138
565 <3/25(수) 오후4:30분> 슈퍼컴퓨터와 국가경쟁력 2015.03.19 61320
564 <8/24(Fri.) 3:30pm>Secret interactions of light sterile neutrinos with the DSNB 2018.08.21 61426
563 <1/16(금)> Systems biology of genetic oscillations: Application to phenotypic switches 2015.01.13 61895
562 <June.5(Wed.)> Fluid gravity duality 2019.05.29 61920
561 <5/6(수) 오후4:30분> 빛의 여행 2015.04.29 62012
» <6/2(화)> 세미나 개최 안내 2015.06.01 62076
559 <Nov. 23(Wed.) 4:30 PM> Dry (Plasma) etch process in Semiconductor Device 2016.11.16 62143
558 <4/1(수) 오후4:30분> 과학기술과 미디어 2015.03.26 62153
557 <3/11(수) 오후4시:30분> 테크노-이매지네이션(Techno-imagination) 2015.03.04 62259
556 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.14 62542
555 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.10 62552
554 <Nov.15(Wed.) 4:30 PM> Mixed metal oxide films for energy and memory device applications 2017.11.08 62561
553 <Oct. 5(Wed.) 4:30 PM> 국제원자력기구 (IAEA)와 핵데이터 2016.09.22 62598
552 <Oct. 19(Wed.) 10:00 AM> Hyper-Kamiokande project -The future of neutrino physics in Japan 2016.10.12 62732
551 <Mar.13(Wed.)> Physics in Medicine: Magnetic Resonance Imaging 2019.03.07 62815
550 <5/20(수) 오후4:30분> Nonequilibrium statistical physics for Brownian heat engine 2015.05.14 62962
549 <Nov. 11(Wed.) 4:30 PM> 그래핀 산업의 현황과 전망 2015.11.09 63095
548 <1/2> MYRRHA Project (EU 4세대 원전 사업) 2013.12.30 63205
547 <1/16(Wed) 4:00pm> Band Representation Analysis of Intersecting Nodal Rings in Semiconducting Layers 2019.01.09 63246
546 <11/22> Spin polarization of photoelectrons from a topological insulator 2012.10.22 63626