Microscopic elucidation and functionality optimization of TMR device structures containing a barrier layer of monolayer honeycomb structures.

2014 Fiscal Year Final Research Report

• Project/Area Number: 25870465
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nanostructural physics; Thin film/Surface and interfacial physical properties
• Research Institution: Hiroshima University
• Principal Investigator: SAWADA Masahiro 広島大学, 放射光科学研究センター, 准教授 (00335697)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 超薄膜 / 磁気円二色性 / グラフェン

Outline of Final Research Achievements

In-situ experiments of high-precision films fabrication under ultra high vacuum and magnetic spectroscopy with synchrotron radiation were carried out in order to investigate atomic structures, magnetic and electronic states at the interfaces of layered structures composed of a graphene and a magnetic monolayer, whose layered structure is expected to be a candidate for spintronic materials. At the interface of Graphene/Fe/Ni(111) obtained by intercalation of Fe, ferromagnetic state with in-plane magnetization was observed in the Fe layers thinner than 2 monolayer, where local magnetic moments at Fe atomic site are lager than the case of Fe bulk crystal. Above 3 monolayers of Fe, however, magnetically dead sites were found in the layered structures, which indicate the thickness control of Fe in the thinnest region is crucial for existence of ferromagnetic interface that is a prerequisite of spin-injection to the graphene layer.

Free Research Field

物性