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Electronic structure and magnetic properties of graphene/Co composites

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arxiv 1411.3863 v1 pith:RVZ4R6HG submitted 2014-11-14 cond-mat.mtrl-sci

Electronic structure and magnetic properties of graphene/Co composites

classification cond-mat.mtrl-sci
keywords metalmagneticmeasurementscompositesgraphenepropertiesoxideoxidized
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The results of measurements of XPS spectra and magnetic properties of graphene/Co composites prepared by adding of CoCl$_2$x6H$_2$O diluted in ethyl alcohol to highly-splitted graphite are presented. XPS Co 2p measurements show two sets of 2p$_{3/2,1/2}$-lines belonging to oxidized and metallic Co-atoms. This means that metal in composite is partly oxidized. This conclusion is confirmed by magnetic measurements which show the presence of the main (from the metal) and shifted (from the oxide) hysteresis loops. The presence of oxide layer on the metal surface prevents the metal from the full oxidation and (as shown by magnetic measurements) provides the preservation of ferromagnetic properties after long exposure in ambient air which enables the use of graphene/metal composites in spintronics devices.

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