Abstract
A triple-decker SYML-Dy2 single-molecule magnet (SMM) was synthetized and grafted onto the surface of iron oxide nanoparticles (IO-NPs) coated by an oleic acid monolayer. The magnetism of the SYML-Dy2 complex, and the hybrid system, NP-Dy2, were studied by a superconducting quantum interference device (SQUID). Density functional theory (DFT) calculations were carried out to study both the energetics of the interaction between SYML-Dy2 complex to the organic capping, and the assembly presented by the oleic acid chains.
Highlights
The use of magnetic molecules in devices has been a goal since the discovery of single-molecule magnets (SMMs) in the 1990s
The transmission electron microscopy (TEM) images (Figure 6) of the iron oxide nanoparticles (IO-NPs) loaded with SYML-Dy2 showed that the size distribution was similar to that of the unloaded NP sample
If we take into account the Ms per gram of iron oxide, the hybrid system value is higher than that hysteresis loops of the hybrid material caused by the effect of the molecules via the organic layer of of the IO-NP
Summary
The use of magnetic molecules in devices has been a goal since the discovery of single-molecule magnets (SMMs) in the 1990s. The deposition of SMMs on a naked magnetic surface affects their molecular properties by coupling with the surface; a decrease of magnetization takes place In this context, it is vital to control the chemical bonding or physisorption between the magnetic molecules and magnetic electrodes in order to tailor the exchange coupling interaction, and subsequently, the magnetoresistance response of the device. Our system is completely different: the SAM of oleic acid caps the iron oxide NP, and ensures that there is no direct magnetic exchange coupling between the iron oxide and the molecular SMM. Both the conformation of the capping monolayer and the adsorption of the SMM onto it are controlled by noncovalent interactions. We perform here a DFT-D study of the internal conformation of the oleic acid monolayer on a simplified model, as well as of the capping layer-SMM interface, to demonstrate that the adsorption of the SMM is energetically favorable
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