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Issue 31, 2018
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Dipolar magnetism in assembled Co nanoparticles on graphene

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Abstract

The magnetic properties of the assembled Co nanoparticles on graphene were studied using X-ray magnetic circular dichroism (XMCD), magneto-optical Kerr effects, and a modeling simulation. We demonstrate that the superparamagnetic nanoparticles reveal a ferromagnetic phase when they are assembled on graphene. The moderate increase of the XMCD asymmetry and magnetization with coverage for this assembly indicates a dipolar-mediated magnetism, which is further verified by a model simulation considering the dipolar interaction between neighboring nanoparticles. Furthermore, C K-edge spectra reveal visible dichroism at the π* state of graphene, which indicates the existence of a spin-polarized interface state, while the assembled Co nanoparticles reveal a ferromagnetic phase. These results suggest an efficient route to stabilize the ferromagnetic phase of nanostructures on graphene by tailoring dipolar interactions, which is essential to realize a higher efficiency of spin injection in graphene-based spintronics.

Graphical abstract: Dipolar magnetism in assembled Co nanoparticles on graphene

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Publication details

The article was received on 17 May 2018, accepted on 13 Jul 2018 and first published on 17 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP03145B
Citation: Phys. Chem. Chem. Phys., 2018,20, 20629-20634
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    Dipolar magnetism in assembled Co nanoparticles on graphene

    Y. Chan, C. Huang, Y. Chang, Y. Lu, S. Wu, D. Wei and C. Kuo, Phys. Chem. Chem. Phys., 2018, 20, 20629
    DOI: 10.1039/C8CP03145B

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