4.7 Article

Magnetic Memory from Site Isolated Dy(III) on Silica Materials

期刊

ACS CENTRAL SCIENCE
卷 3, 期 3, 页码 244-249

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.7b00035

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资金

  1. Marie Curie fellowship [317127]
  2. Swiss National Science Foundation [SNF 200021_137691/1]
  3. U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Biosciences, and Geosciences Division (CSGB), Heavy Element Chemistry Program
  4. Lawrence Berkeley National Laboratory [DE-AC02-05CH11231]
  5. U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
  6. Agence Nationale de la Recherche [ANR-13-BS07-0022-01]

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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.

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