title: Magnetic Memory from Site Isolated Dy(III) on Silica Materials.
abstract: Achieving magnetic remanence at single isolated metal sites dispersed at the surface of a solid matrix has been envisioned as a key step toward information storage and processing in the smallest unit of matter. Here, we show that isolated Dy(III) sites distributed at the surface of silica nanoparticles, prepared with a simple and scalable two-step process, show magnetic remanence and display a hysteresis loop open at liquid4He temperature, in contrast to the molecular precursor which does not display any magnetic memory. This singular behavior is achieved through the controlled grafting of a tailored Dy(III) siloxide complex on partially dehydroxylated silica nanoparticles followed by thermal annealing. This approach allows control of the density and the structure of isolated, "bare" Dy(III) sites bound to the silica surface. During the process, all organic fragments are removed, leaving the surface as the sole ligand, promoting magnetic remanence.
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland.
authors.forename: Florian
authors.initials: F
authors.lastname: Allouche
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Lapadula
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland.
authors.forename: Georges
authors.initials: G
authors.lastname: Siddiqi
authors.affiliation: Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Wayne W
authors.initials: WW
authors.lastname: Lukens
authors.affiliation: Univ Lyon, Ecole Normale supérieure de Lyon, Laboratoire de Chimie UMR 5182 CNRS-Université Claude Bernard Lyon 1-ENS Lyon , 46 Allée d'Italie, 69364 Lyon Cedex 07, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Maury
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1 , 35042 Rennes Cedex, France.
authors.forename: Boris
authors.initials: B
authors.lastname: Le Guennic
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1 , 35042 Rennes Cedex, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Pointillart
authors.affiliation: Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen PSI, Switzerland.
authors.forename: Jan
authors.initials: J
authors.lastname: Dreiser
authors.affiliation: Laboratoire de Chimie des Processus Biologiques, CNRS UMR 8229, Collège de France, Université Pierre et Marie Curie , 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.
authors.forename: Victor
authors.initials: V
authors.lastname: Mougel
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1 , 35042 Rennes Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Cador
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland.
authors.forename: Christophe
authors.initials: C
authors.lastname: Copéret