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 2022학년도 1학기 콜로퀴움 일정 2022.01.10 1921
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813335
293 <Jan. 27(Thu.)>Emulating twisted double bilayer graphene with a multiorbital optical lattice 2022.01.18 10
292 <Nov. 29(Mon.)>Exploring light-matter interactions at atomic scale using electron microscopy 2021.11.22 1532
291 <Nov. 5(Fri.)>Strongly Coupled Moire Photonics 2021.11.01 1834
290 <Aug. 4(Wed.)>Electronic Properties of Mixed-dimensional 2D/3D Heterostructures 2021.08.04 17151
289 <Aug. 6(Fru.)> Gravitationally probing dark matter (DM) microphysics 2021.08.03 4811
288 <July 21(Wed.)> Strongly Correlative Ionics 2021.07.19 4596
287 <July 14(Wed.)> B1g phonon anomaly driven by Fermi surface instability at intermediate temperature in YBa2Cu3O7−δ 2021.07.13 5994
286 <July 7(Wed.)>Functional rare earth ionic defects and the related phenomena 2021.07.02 9464
285 <June 30(Wed.)>Mapping of magnetic anisotropy for van der Waals materials 2021.06.25 5314
284 <June 23(Wed.)>Valley Polarization and Exciton Hall Effect in Transition Metal Dichalcogenides 2021.06.22 6933
» <June 10(Thu.)>Oxide electronics utilizing spin-orbit coupling 2021.05.31 8527
282 <June 01(Tue.)>Frustration-induced Athermal Behaviors: Hilbert Space Fragmentation and Quantum Many-Body Scars 2021.05.24 8879
281 <May 04(Tue.)>Flat bands and the geometry of Bloch wave function 2021.04.27 24490
280 <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 22477
279 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 13164
278 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 29965
277 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 32887
276 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 18178
275 <2/17(Mon.)> Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry 2020.02.11 39078
274 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 42934