Nanometer-scale paleomagnetism by the electron holography

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13909
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Hokkaido University
• Principal Investigator: Kimura Yuki 北海道大学, 低温科学研究所, 准教授 (50449542)
• Co-Investigator(Renkei-kenkyūsha): YAMAMOTO Kazuo 一般財団法人ファインセラミックスセンター, ナノ構造研究所, 主任研究員 (80466292)
• Research Collaborator: TANIGAKI Toshiaki ; NAKAMURA Norihiro
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: ナノ粒子 / 透過電子顕微鏡 / 隕石 / 宇宙塵 / 残留磁化

Outline of Final Research Achievements

We applied well known paleomagnetism to a nanometer-scale mineral in a meteorite for determination of temperature and magnetic field at the time of formation of nano-minerals in a mother asteroid of carbonaceous chondrite 4.6 billion years ago based on magnetic remnant observed using the electron holography. We successfully visualized a magnetic remnant of individual nano-minerals, which has been hidden in a total bulk value in case of traditional bulk analysis. We focused on magnetite particles in a carbonaceous meteorite and successfully determined its formation temperature in their parent body based on in-situ electron holography observation in a heating experiment.

Free Research Field

ナノ領域科学