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 1078338
225 <5/1> Supersymmetry Breaking in Chern-Simons-matter Theories 2012.04.30 73195
224 <5/9> Searching for 5th dimension 2012.05.03 73167
223 <3/28> 양자물리학의 성립 과정 2012.03.22 72900
222 <12/1>21세기 관측우주론 2006.11.28 72863
221 <2/7>Emergent p-wave Kondo Coupling in Multi-Orbital Bands with Mirror Symmetry Breaking 2013.02.06 72832
220 <9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase 2016.08.29 72787
219 <12/2(화)> Emergent Quantum Phenomena in SrTiO3 Heterostructures 2014.11.21 72561
218 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 72431
217 <6/15(Fri.) ~ 16(Sat.)> Formation of first star and galaxy, Gravitational waves from Binary Mergers of Sub-Solar Mass Dark Black Holes 2018.06.12 71985
216 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 71859
215 <12/12> 자성체의 스커미온 동역학 2012.12.06 71855
214 <5/30> Dark Energy 2012.05.23 71818
213 <9/21> 금융공학과 금융산업 2007.09.17 71801
212 <12/5> 과학용어와 의학용어에 숨겨진 이야기 2012.11.28 71729
211 2013학년도 1학기 콜로퀴움 일정 2013.02.19 71626
210 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 71569
209 <6/4> Korea's challenges ahead for nuclear energy industry 2010.05.31 71557
208 <10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes 2016.10.10 71482
207 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 71476
206 <6/11> 나노제조기술의 개요 및 응용 2010.06.07 71453