Anisotropy and Damping of Molecules/Cobalt Hybrid Thin Films

Abstract

We have investigated the magnetic properties of evaporated Co thin films covalently functionalized with different organic thin films, namely (1-(2-bisthienyl benzene) and nitro-benzene. The coating is realized thanks to a diazonium-based electro-reduction process. Brillouin light scattering experiments revealed that the magnetic properties are sensitive to the presence of the organic film. For (1-(2-bisthienyl benzene) thin films, the perpendicular magnetic anisotropy is increased as well as the magnetic damping. However for nitrobenzene, only the perpendicular anisotropy is increased albeit less than for (1-(2-bisthienyl benzene). This change in magnetic properties might be attributed to the coupling with the organic molecules.

Electrochemically deposited molecular thin films on transparent conductive oxide substrate: combined DC and AC approaches for characterization

“…In this view, e-chem grafting of aryl diazoniums is quite more prevailing as it provides a highly robust, stable, controllable thin film thickness with regular surface coverage. [15][16][17] This technique has been utilized in modifications of several other non-magnetic and magnetic conductive substrates such as gold, 18,19 doped silicon, 20 carbon, 21 nickel, 22,23 cobalt, 24 and iron, 25 , etc. The e-chem grafting technique generally entails two steps: first, the generation of aryl radical and removal of N 2 by single-electron reduction of diazonium, and second, the attachment of aryl radical to the substrate by the covalent bond formation between the substrate and aryl radicals giving rise to a highly stable thin film.…”