korean english


Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다.


아 래


제목: Revealing magnetism of nanoislands with quantitative insights into spin-polarized scanning tunneling spectroscopy


연사: 박   수   현  박사님 (Max-Planck-Institut für Mikrostrukturphysik, Germany)

일시: 2013. 11. 11(월) 오후 4:00


장소: 제1과학관 3층 물리학과세미나실 31355호실


초록: The spin-dependent electronic structure1 and magnetization reversal2 of individual nanostructures have been successfully characterized by spin-polarized scanning tunneling microscopy/spectroscopy (SP-STM/S). In this talk, we present an application of SP-STM/S for a quantitative characterization of the magnetic properties3 of the tip used as a probe in SP-STM and for the investigation of the spin-dependent electronic structure in bilayer high Fe nanoislands.
We observe a superparamagnetic response of Fe-coated W tips. A temperature-dependent change of the spectroscopy signal, measured on biatomic-layer-high Co nanoislands on Cu(111)1,2 in magnetic fields oriented along the sample normal, shows a reduced slope around zero field of the field-dependent differential conductance for an increased temperature (Fig. 1). A quantitative analysis of the field- and temperature-dependent differential conductance data in the framework of superparamagnetism suggests that a magnetically isolated Fe nano-apex of a few hundreds Fe atoms determines the magnetic response of the tip.3
We also apply SP-STM/S to elucidate the magnetic state of a bilayer Fe islands on Cu(111), where the second layer Fe atoms are positioned at bridge sites of the underlying first Fe layer4. SP-STM/S reveals a magnetic contrast of a stripe pattern with a period of 1.28 nm, as shown in Fig. 2. Our detailed analysis of the magnetic-field-dependent stripe contrast with the characterization of the tip magnetization states clearly indicates that a non-collinear periodic spin-ordering is responsible for the stripe pattern. The electronic origin of this non-collinear spin-state is discussed.


번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1057533
136 <6/21> Nuclear Astrophysics in Effective Field Theories 2012.06.20 84257
135 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 84297
134 <10/23> Measuring Transfer Reactions with Radioactive Beams 2012.10.15 84368
133 <10/12(Wed.) 11:00am>Unconventional Superconductivity: From History to Mystery 2016.10.10 84375
132 <9/10> Nanomaterials for Biotech Applicastions 2007.09.05 84733
131 <5/22> 정상욱 교수 초청 세미나 Overview of Multiferroics 2006.05.19 84871
130 <6/17> Molecular dynamics simulation to study amorphous structure of Ge2Sb2Te5 2009.06.03 84897
129 <7/8> 신물질 고온초전도 초청강연 2009.06.26 85039
128 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 85280
127 <1/17>Quantum criticality and superconductivity 2008.01.16 85461
126 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 85557
125 <10/22(Tue.)>To p or not to p? – 17O NMR of Sr2RuO4 under strain file 2019.10.17 85810
124 <2/8(Fri) 11:0 am ~ >Intertwined states in the pure and Nd-doped heavy fermion superconductor CeCoIn5 2019.02.08 85843
123 <3/26>A perturbative & non-perturbative test of ABJM model 2009.03.19 85946
122 <5/3> APOLLO Program: Understanding Neutron-Rich Nuclei for r-Process Nucleosynthesis 2012.05.03 86234
121 <8/7> Scotch tape and spectroscopy: probing and manipulating the surface of a topological insulator 2012.07.27 86356
120 <11/4 오후 3:30> Surface impurity induced self energy in bulk on a topological insulator 2013.10.23 86426
119 <7월27일>Correlated topological phases in 3D complex oxides via Green's functions 2012.07.27 86554
118 <7/21> Next generation cryogenic free 1.5T MgB2-magnet based MRI 2010.07.20 86805
117 <5/16> superconformal index with line operators and domain walls 2012.05.14 87303