Air-Protected Epitaxial Graphene/Ferromagnet Hybrids Prepared by Chemical Vapor Deposition and Intercalation
详细信息 查看全文
- 作者：Johann Coraux ; Alpha T. N鈥橠iaye ; Nicolas Rougemaille ; Chi Vo-Van ; Amina Kimouche ; Hong-Xin Yang ; Mairbek Chshiev ; Nedjma Bendiab ; Olivier Fruchart ; Andreas K. Schmid
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：August 2, 2012
- 年：2012
- 卷：3
- 期：15
- 页码：2059-2063
- 全文大小：283K
- 年卷期：v.3,no.15(August 2, 2012)
- ISSN：1948-7185
文摘
The extended carbon鈥搈etal contact in graphene鈥搈etal hybrids opens new avenues for manipulating the properties of both constituents of the hybrid and for combining the functionalities of each of them. We developed a two-step ultrahigh vacuum route to fabricate high-quality nanometer-thick metal films having abrupt interfaces, sandwiched between a protective graphene layer and its substrate, using chemical vapor deposition and metal intercalation made effective at mild temperatures. We demonstrate functional hybrid systems with ferromagnetic metal films whose topmost graphene interface allows us to manipulate the direction of the magnetization of the film to a large extent. We obtain prominently perpendicular magnetization for a large range of Co thickness. The preparation and properties of the graphene/ferromagnet hybrid are analyzed using a set of surface-sensitive in situ and ex situ techniques together with first-principles calculations, altogether providing extensive topographic, chemical, magnetic, and vibrational characterization.