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이번 학기 콜로퀴움은 학교의 권고를 따라, 사회적 거리두기 단계와 연계하여 온라인 혹은 오프라인(온라인 방송 병행)으로 운영될 예정입니다.

세번째 강연에는 중앙대학교 물리학과의 이상권 교수님을 모시고 콜로퀴움을 개최하오니, 학과 구성원 여러분의 많은 참여를 부탁 드립니다.

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1. Title: Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer

2. Speaker: 이  상  권  교수님 (중앙대학교 물리학과)

3. Date & Time: Sep. 29(Wed.) 2021.  4:30 PM

4. Place: Natural Science 1,  Room No. 31214

 5. Abstract: In this talk, I will present a novel approach for enhancing the spin current injected into a normal metal, Pt, using interface effects with a ferromagnetic insulator, yttrium iron garnet (YIG). This was accomplished by inserting atomically thin monolayer (ML), tungsten diselenide (WSe2) between Pt and YIG layers using longitudinal spin Seebeck effect (LSSE) measurements. We found that the insertion of ML WSe2 between the Pt and YIG layers significantly enhanced the thermopower, VLSSE/T by a factor of approximately 5.6 compared with that of the Pt/YIG reference sample. This enhancement in the measured LSSE voltages in the Pt/ML WSe2/YIG trilayer can be explained by the increased spin-to-charge conversion at the interface owing to the large spin-orbit coupling and improved spin mixing conductance with the ML WSe2 intermediate layer. We also discuss the enhanced spin current in terms of magnetic properties of the chalcogenide materials. At the end of my talk, I will briefly introduce the research topics that we are currently conducting in our research laboratory in Chung-Ang University.

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