Control of edge atomic structure of carbon mono-atomic layer and research of spin-based phenomena and magnet application

2014 Fiscal Year Final Research Report

• Project/Area Number: 24241046
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: Aoyama Gakuin University
• Principal Investigator: HARUYAMA Junji 青山学院大学, 理工学部, 准教授 (70296383)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: グラフェン / エッジ / 平坦バンド / 強磁性 / 偏極スピン / 水素終端 / 磁石 / スピントロニクス素子

Outline of Final Research Achievements

We have fabricated graphene nanomesh (GNM), which has honeycomb-like array of nanopores with low defects and low contamination, by non-lithographic method within reproducibility as high as over 70%. Controlling atomic structure of the pore edge to zigzag by critical temperature annealing resulted in realization of flat-band ferromagnetism. High-efficiency GNM magnet, which has the strength was obtained by HSQ resist treatment of this GNM and irradiating electron beam, because mono-hydrogenation of the edge dangling bond was realized through this process. TMR structure was realized by using this magnetic GNM as an electrode and TMR ratio over 20% was realized even at room temperature. These results open doors to rare-magnetic-element free magnets and spintronic devices.

Free Research Field

量子物性実験