title: Magnetic memory of a single-molecule quantum magnet wired to a gold surface.
abstract: In the field of molecular spintronics, the use of magnetic molecules for information technology is a main target and the observation of magnetic hysteresis on individual molecules organized on surfaces is a necessary step to develop molecular memory arrays. Although simple paramagnetic molecules can show surface-induced magnetic ordering and hysteresis when deposited on ferromagnetic surfaces, information storage at the molecular level requires molecules exhibiting an intrinsic remnant magnetization, like the so-called single-molecule magnets (SMMs). These have been intensively investigated for their rich quantum behaviour but no magnetic hysteresis has been so far reported for monolayers of SMMs on various non-magnetic substrates, most probably owing to the chemical instability of clusters on surfaces. Using X-ray absorption spectroscopy and X-ray magnetic circular dichroism synchrotron-based techniques, pushed to the limits in sensitivity and operated at sub-kelvin temperatures, we have now found that robust, tailor-made Fe(4) complexes retain magnetic hysteresis at gold surfaces. Our results demonstrate that isolated SMMs can be used for storing information. The road is now open to address individual molecules wired to a conducting surface in their blocked magnetization state, thereby enabling investigation of the elementary interactions between electron transport and magnetism degrees of freedom at the molecular scale.
authors.affiliation: Department of Chemistry and INSTM research unit, University of Florence, 50019, Sesto Fiorentino, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Mannini
authors.forename: Francesco
authors.initials: F
authors.lastname: Pineider
authors.forename: Philippe
authors.initials: P
authors.lastname: Sainctavit
authors.forename: Chiara
authors.initials: C
authors.lastname: Danieli
authors.forename: Edwige
authors.initials: E
authors.lastname: Otero
authors.forename: Corrado
authors.initials: C
authors.lastname: Sciancalepore
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Talarico
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Arrio
authors.forename: Andrea
authors.initials: A
authors.lastname: Cornia
authors.forename: Dante
authors.initials: D
authors.lastname: Gatteschi
authors.forename: Roberta
authors.initials: R
authors.lastname: Sessoli