Adv. Funct. Mat. [CLAC]

Abstract :

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.

Reference :

G. Avedissian, J. Arabski, J. A. Wytko J. Weiss, C. Meny
Probing the Growth of Organic Molecular Films Embedded between Cobalt and Iron Electrodes: Ferromagnetic Nuclear Resonance Approach
Adv. Funct. Mat., first published: 9 September 2020, DOI – 10.1002/adfm.202005605

Contacts :

J. Weiss, J. A. Wytko, équipe CLAC, Institut de Chimie (UMR 7177).