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Journal Articles ACS Central Science Year : 2017

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 liquid 4 He 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.
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hal-01480162 , version 1 (01-03-2017)

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Florian Allouche, Giuseppe Lapadula, Georges Siddiqi, Wayne W. Lukens, Olivier Maury, et al.. Magnetic Memory from Site Isolated Dy(III) on Silica Materials. ACS Central Science, 2017, 3 (3), pp.244-249. ⟨10.1021/acscentsci.7b00035⟩. ⟨hal-01480162⟩
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