Magnetic coupling of porphyrin molecules through graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 23695989.
- Also identified by DOI 10.1002/adma.201205275.
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Abstract
X-ray magnetic circular dichroism (XMCD) measurements and density functional theory (DFT)+U calculations reveal an unexpected antiferromagnetic coupling between physisorbed paramagnetic Co-porphyrin molecules and a Ni surface, separated by a graphene layer. A positive magnetization at the Ni substrate atoms is mediated by graphene and induces a negative one at the Co site, despite only a very small overlap between macrocyclic π and graphene pz -orbitals.