logo

korean english

게시판

Home > 게시판 > 세미나

에피 산화물 연구실에서 Osaka University의 Jobu Matsuno 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

온라인으로 진행되는 세미나입니다.

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

Title: Oxide electronics utilizing spin-orbit coupling


Speaker: Prof. Jobu Matsuno  (Osaka University)


Date/time: 2021. 6. 10 (Thu.) 10:00 - 11:30 AM


○ 온라인 참여방법: https://pusan.zoom.us/j/84514331691?pwd=MW9xaGpoUHNHS0o2VEYzZ1Z4QTlpdz09
   

Abstract: A strong spin-orbit coupling (SOC) inherent to 5d electron systems recently
emerged as a new paradigm for oxide electronics. For example, we investigated novel
physics of spin-orbital Mott insulators [1] and possible topological insulators [2] by tuning
the electronic phases through superlattice technique. In this talk, we suggest that 5d Ir
oxides are promising class of spintronic materials by focusing on two topics: magnetic
skyrmion and spin current.


Magnetic skyrmion is a topological spin texture, which is promising for low-power
electronics since it can be driven by tiny current. We have studied transport properties of
SrRuO3-SrIrO3 bilayers to observe an anomaly in the Hall resistivity in addition to
anomalous Hall effect (AHE); this is attributed to topological Hall effect (THE) [3]. The
results suggest that magnetic skyrmions of 10–20 nm are generated by the combination
of broken inversion symmetry at the interface and strong SOC of SrIrO3. Even more
surprising is that we can control both AHE and THE by electric field in the SrRuO3-SrIrO3
bilayers [4]. The results established that strong SOC of nonmagnetic SrIrO3 is essential
in electrical tuning of these Hall effects.


Spin-current is a flow of spin angular momentum without any charge current; low-power
electronics is expected based on spin current. A charge current can be converted into a
spin current and vice versa, known as the spin Hall effect (SHE) and the inverse spin Hall
effect (ISHE). We demonstrated a large ISHE of IrO2, one of the simplest 5d oxides [5].
Very recently we also evidenced a large SHE of IrO2 through spin-orbit torque generation
[6]. The results indicate that Ir oxides are promising class of spintronic materials in terms
of spin current.


References:
[1] J. Matsuno et al., Phys. Rev. Lett. 114, 247209 (2015). [4] Y. Ohuchi et al., Nat. Commun. 9, 213 (2018).
[2] D. Hirai et al., APL Mater. 3, 041508 (2015). [5] K. Fujiwara et al., Nat. Commun. 4, 2893 (2013).
[3] J. Matsuno et al., Sci. Adv. 2, e1600304 (2016). [6] K. Ueda et al., Phys. Rev. B 102, 134432 (2020).

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1090494
42 <Oct.15(Thu) 16:30> Single-Molecule Approach to Homology Search & Strand Exchange in Homologous Recombination 2015.10.12 127125
41 <7/20(Thu.)14:00>Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer 2017.07.18 127474
40 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 128412
39 <4/30(화)> DC (DNA Curtains) and AC (Actin Curtains) in single-molecule biophysics 2013.04.11 128626
38 <10/28>Grazing Incidence X-ray Diffraction and Surface X-ray Scattering Study of Hematite (α-Fe2O3) Nano-cube 2011.10.26 129895
37 <7/21(월)> The rapid neutron capture nucleosynthesis: A hot topic in the Nuclear Astrophysics study 2014.07.15 130219
36 <4/14> X-ray absorption fine structure analyses on amorphous oxide films 2009.04.06 131305
35 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 132740
34 <5/3> High-Speed MOSFET Technology: State-of-the-Art Strain Engineering 2006.05.02 134686
33 <Nov.13(Fri) 16:00> Kondo screening in mixed valence and heavy fermion compounds and the signatures of Nozieres’ exhaustion 2015.11.04 135003
32 <3/12(화)>물리학과 특별초청강연 개최 안내 2013.03.04 135553
31 <12/30> Dirac vs. Weyl in topological insulators: Adler-Bell-Jackiw anomaly in transport phenomena 2013.12.16 135972
30 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 140400
29 <7/25(목) 오전11시> 물리학과 특별세미나 개최 안내 2013.07.19 142651
28 <11/22>A Glimpse of X-ray Sky 2006.11.16 144118
27 <12/21(금)> Theory of topological quantum phase transitions in 3D noncentrosymmetric systems 2012.12.05 144248
26 <Oct. 20(Tue.) 2:00 PM> High-throughput Synthesis of Oxide Thin Films 2015.10.05 150845
25 <11/11>Leptogenesis in triplet seesaw models 2006.11.08 154674
24 <12/26> Emergent Physics in 3D Correlated Topological Semimetals file 2013.12.20 157575
23 <6/25(화)>물리학과 특별세미나 개최 안내 2013.06.24 165335