Probing the Growth of Organic Molecular Films Embedded between Cobalt and Iron Electrodes: Ferromagnetic Nuclear Resonance Approach

Physical properties of magnetic nanostructures and devices strongly depend on the morphological characteristics of their various components. This is especially true and becomes particularly complex in hybrid nanostructures, where soft organic molecules are at the vicinity of ferromagnetic metallic f...

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Bibliographic Details
Published in:Advanced functional materials 2020-11, Vol.30 (46), p.n/a
Main Authors: Avedissian, Garen, Arabski, Jacek, Wytko, Jennifer A., Weiss, Jean, Meny, Christian
Format: Article
Language:English
Subjects:
Chemical Sciences
Cobalt
Ferromagnetic materials
Ferromagnetic resonance
ferromagnetism
Iron
Magnetic properties
Material chemistry
Materials science
Morphology
Nanostructure
nanostructures
Organic chemistry
organics
Physical properties
Pinholes
Porphyrins
Resonance
solid‐state NMR
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Summary:Physical properties of magnetic nanostructures and devices strongly depend on the morphological characteristics of their various components. This is especially true and becomes particularly complex in hybrid nanostructures, where soft organic molecules are at the vicinity of ferromagnetic metallic films. The supramolecular architecture of molecular films embedded between Fe and Co layers is investigated by ferromagnetic nuclear resonance (FNR). With such sample architecture, the presence of pin holes in the organic layers is detected by FNR contributions in a specific spectral range. The methodology that is developed allows the probing of the continuity and the packing of zinc tetraphenyl porphyrin (ZnTPP) molecular films between the Co and Fe films. The experimental results suggest that, regardless of the nature of the ferromagnetic underlayer, at least 15 monolayers of ZnTPP are necessary to form continuous and pin‐hole free molecular films. In addition, quantitative analyses show that ZnTPP layers exhibit distinct morphologies that are dependent on the nature of the ferromagnetic metallic underlayer. Poor control of the morphology of hybrid metal organic heterostructures and devices can lead to scientific misunderstandings. Ferromagnetic nuclear resonance is used herein, to investigate organic layers sandwiched between ferromagnetic metallic electrodes. For zinc tetraphenyl porphyrin, 15 monolayers of organics are necessary to form continuous molecular films. The organic layers exhibit distinct morphologies depending on the ferromagnetic metallic underlayer.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202005605