W. Q. Liu

Nanjing University

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A. Zhang

CEA Paris-Saclay

Qiuju Li

Nanjing University of Aeronautics and Astronautics

Feng Jin

Chinese Academy of Sciences

Q. M. Zhang

Lanzhou University

Jingyang Wang

Nanjing University

Cong Lu

Southeast University

Fengqiu Wang

Nanjing University

Weiyi Wang

University of Science and Technology of China

G. van der Laan

Diamond Light Source

R. Zhang

Harbin University of Commerce

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Nanjing University

Collaborative Innovation Center of Advanced Microstructures

Chinese Academy of Sciences

University of Chinese Academy of Sciences

National Laboratory of Solid State Microstructures

University of York

Institute of Physics

Renmin University of China

Chinese Academy of Agricultural Sciences

Beihang University

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Atomic-Scale Interfacial Magnetism in Fe/Graphene Heterojunction

Scientific Reports (2015)

W. Q. Liu Weiyi Wang Jingyang Wang Fengqiu Wang Cong Lu

Abstract Successful spin injection into graphene makes it a competitive contender in the race to become a key material for quantum computation, or the spin-operation-based data processing and sensing. Engineering ferromagnetic metal (FM)/graphene heterojunctions is one of the most promising avenues to realise it, however, their interface magnetism remains an open question up to this day. In any proposed FM/graphene spintronic devices, the best opportunity for spin transport could only be achieved where no magnetic dead layer exists at the FM/graphene interface. Here we present a comprehensive study of the epitaxial Fe/graphene interface by means of X-ray magnetic circular dichroism (XMCD) and density functional theory (DFT) calculations. The experiment has been performed using a specially designed FM 1 /FM 2 /graphene structure that to a large extent restores the realistic case of the proposed graphene-based transistors. We have quantitatively observed a reduced but still sizable magnetic moments of the epitaxial Fe ML on graphene, which is well resembled by simulations and can be attributed to the strong hybridization between the Fe 3 d z2 and the C 2 p z orbitals and the sp -orbital-like behavior of the Fe 3 d electrons due to the presence of graphene.

Magnetism

10.1038/srep11911

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