Controlling the interface poses a challenge when constructing molecular devices. This study shows that it is possible to modulate the electronic and magnetic response of a device by controlling the interaction between the molecules and the electrode surface. Molecular complexes, which were stable in solution and in ambient conditions, were designed by the in- situ formation of ligands around metal ion templates. These molecules display magnetic anisotropy and can be chemically tethered onto ferromagnetic surfaces. Anchoring induced, in the paramagnetic cobalt(II)-containing complex, a magnetic ordering and hysteresis that was studied by X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD) and time-of-flight secondary ion mass spectroscopy (Tof-SIMs). While, we do not observe any coupling with the ferromagnetic electrode for the isostructural nickel(II)- containing complex. This result highlights the fundamental effect that the electronic structure of the metal ion in conjunction with the nature of the organic spacer has on the resulting molecule/electrode interaction. [1] S. Berny, L. Tortech, D. Fichou, S. Matzen, and J.-B. Moussy, Appl. Phy. Lett., 2010, 97, 253303. [2] V. E. Campbell, M. Tonelli, I. Cimatti, R. Guillot, E. Riviere, J.-B. Moussy, L. Tortech, P. Seneor, R. Mattana, Anouk Galtayries, Nathalie Guihery, Florian Koprowiak, Philippe Ohresser, Edwige Otero, Yannick Dappe, M.-A. Arrio, P. Sainctavit and T. Mallah and submitted.

Molecular control of the magnetic exchange between self-assembled metal- complexes and ferromagnetic surfaces for molecular spintronic devices

251st National Meeting (2016)

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