[Seminar] Dr. Yuki Amari "Domain-wall skyrmions in chiral magnets"

Speaker

Dr. Yuki Amari / Keio Univeristy

Title

Domain-wall skyrmions in chiral magnets

Abstract

Magnetic skyrmions have been extensively studied for over a decade. They are considered to have applications for information carriers of next-generation magnetic memories. However, controlling their motion has a difficulty because the trajectory of skyrmions is forced to bend when we drive them using an electric current. This phenomenon is called the skyrmion Hall effect, which is a major obstacle for skyrmion-based technologies. In this talk, we consider domain-wall skyrmions, which are magnetic skyrmions confined within a magnetic domain wall. Domain-wall skyrmions are promising candidates for information carriers of next-generation magnetic memories instead of magnetic skyrmions on a ferromagnetic background because they move along the domain wall and are not subject to the skyrmion Hall effect. We construct domain-wall skyrmion in chiral magnets through both analytical and numerical methodologies, and find a good agreement between the results of the two approaches. We will also discuss the (in)stability of the domain-wall skyrmions in the ferromagnetic phase and chiral soliton lattice phase, also called the spiral phase, in which the ground state is a periodic array of domain walls. This talk is based on the paper arXiv:2311.05174, arXiv:2307.11113, and on-going work.

Biography

March 2019: Ph.D. in Department of Physics, Tokyo University of Science

Apr. 2019 – Mar. 2020 : JSPS Research Fellow, Department of Physics , Tokyo University of Science

Aug. 2020 – Aug.2022 : Senior Researcher, Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research

June 2022 – Mar. 2023 : Postdoctoral Researcher, Department of Physics, The University of Tokyo

Apr. 2023 – present: JSPS Research Fellow, Research and Education Center for Natural Science, Keio University

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