第3回物理工学科教室談話会[Prof. Mathias Kläui ・5/29(水)16:30~]

講 師:Prof. Mathias Kläui
所 属:Institute of Physics, Johannes Gutenberg University Mainz
題 目:Topological Spin-Orbitronics for GreenIT
日 時:2024 年 5 月 29 日(水) 16:30~
Date and Time: May 29, 2024 (Wednesday) 16:30-
場 所:工 6 号館1階大会議室(対面のみ)
Place: Large Conference room, 1st floor, Engineering Bldg. 6(in-person only)

Novel spintronic devices can play a role in the quest for GreenIT if they are stable and can transport and manipulate spin with low power. Devices have been proposed, where switching of topological spin structures by energy-efficient approaches is used. We combine ultimate stability of topological states due to chiral interactions with ultra-efficient manipulation using novel spin torques. In particular orbital torques increase the switching efficiency by more than a factor 10.
We use skyrmion dynamics for non-conventional stochastic computing applications, where we developed skyrmion reshuffler devices based on skyrmion diffusion, which also reveals the origin of skyrmion pinning. Such diffusion can furthermore be used for Token-based Brownian Computing and Reservoir Computing.
We go beyond simple ferromagnets and study multilayers with antiferromagnetic coupling termed synthetic antiferromagnets. We find that the diffusion dynamics is drastically enhanced due to the topology.

Mathias Kläui is professor of physics at Johannes Gutenberg-University Mainz and adjunct professor at the Norwegian University of Science and Technology.
He received his PhD at the University of Cambridge, after which he joined the IBM Research Labs in Zürich. He became associate professor in a joint appointment between the EPFL and the PSI in Switzerland before moving to Mainz. His research focuses on nanomagnetism and spin dynamics on the nanoscale in new materials. He is a Fellow of the IEEE, IOP and APS and has been awarded a number of prizes and scholarships. He was also a visiting professor at Tohoku University in 2016 and spent a sabbatical at the University of Tokyo in 2023.
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紹介教員: 齊藤英治教授(物理工学専攻)、沙川貴大教授(物理工学専攻)