Control of magnetization distribution in MnV2O4 using pressure: correlation between orbital-ordered and magnetic domains revealed by TEM

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630299
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Tohoku University
• Principal Investigator: MURAKAMI Yasukazu 東北大学, 多元物質科学研究所, 准教授 (30281992)
• Co-Investigator(Kenkyū-buntansha): AKASE Zentaro 東北大学, 多元物質科学研究所, 助教 (90372317)
• Co-Investigator(Renkei-kenkyūsha): SHINDO Daisuke 東北大学, 多元物質科学研究所, 教授 (20154396) ; ARIMA Taka-hisa 東京大学, 新領域創成科学研究科, 教授 (90232066)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 電子顕微鏡 / ドメイン構造 / 磁区 / 双晶 / 電子線ホログラフィー / ローレンツ顕微鏡法

Outline of Final Research Achievements

The complex magnetic microstructure in MnV2O4 was studied by using the techniques of in situ transmission electron microscopy. In particular, this study focused on the effect of applied pressure on the magnetization distribution, which is a key for the development of new sensors and actuators. We have developed a method that allows for applying pressure to thin-foil specimens at cryogenic temperatures, using the difference of thermal expansion between the MnV2O4 crystal and the Mo plate. The observations demonstrate that the applied pressure significantly affect the twinning microstructure, which is attributed to the orbital order of V-3d electrons, and accordingly controls the magnetization distribution in the MnV2O4 crystal.

Free Research Field

材料科学