Magnetic Memory from Site Isolated Dy(III) on Silica Materials.
Magnetic Memory from Site Isolated Dy(III) on Silica Materials.
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DOI：
10.1021/acscentsci.7b00035
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发表时间：
2017-03-22
影响因子：
18.2
通讯作者：
Copéret C
中科院分区：
文献类型：
--
作者：
Allouche F;Lapadula G;Siddiqi G;Lukens WW;Maury O;Le Guennic B;Pointillart F;Dreiser J;Mougel V;Cador O;Copéret C
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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 4He 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. Isolated Dy(III) ions on a silica matrix, prepared from tailored molecular precursors and silica, display magnetic memory.