Development of time-resolved transmission electron microscopy using highly coherent pulsed electron beams for obversion of magnetic skyrmion motion

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K14117
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Nagoya University
• Principal Investigator: Ishida Takafumi 名古屋大学, 未来材料・システム研究所, 助教 (60766525)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 時間分解電子顕微鏡法 / シングルショットイメージング / ダイレクト電子検出器

Outline of Final Research Achievements

In order to observe motion of fine magnetic strictures such as magnetic skyrmions, a method of time-resolved observation by a pulsed electron beam with a photocathode type electron gun and a direct electron detector was developed in a low-voltage transmission electron microscope. We have succeeded in generating sub-micro second pulsed electron beams at high intensity. In addition, we have realized single-shot imaging at high signal-to-noise ratio using synchronous measurement. A time-resolved transmission electron microscopy with continuous image acquisition at 500 ns interval was established by using high-speed deflector.

Free Research Field

電子顕微鏡法

Academic Significance and Societal Importance of the Research Achievements

本研究で確立した連続で撮影可能な時間分解電子顕微鏡法により超高速で発現する磁気スキルミオンの可視化が期待できる。また、この手法はスキルミオンダイナミクスの観察のみならず低ドーズ観察が要求される生体試料の観察やガスや液体中でのその場観察にも転用可能である。そのため、本技術の確立は電子顕微鏡を用いた生物系・その場観察分野での貢献も期待される。