4.5 Article

Coercivity Ageing Effect on FePt Nanoparticles in Mesoporous Silica via Stepwise Synthesis Strategy

期刊

CHINESE PHYSICS LETTERS
卷 35, 期 6, 页码 -

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IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/35/6/067502

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资金

  1. Natural Science Foundation of Zhejiang Province [LY15E010002]
  2. National Natural Science Foundation of China [51671139]

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FePt nanoparticles in mesoporous silica are fabricated by a simple stepwise synthesis strategy. A pre-annealing temperature-dependent coercivity-ageing effect in FePt nanoparticles is observed at room temperature. For face-centered cubic (fcc) structured FePt nanoparticles, the ageing effect is sensitive to the pre-annealing temperature, especially when the temperature is close to the phase-transition. The special magnetic behavior of FePt nanoparticles reveals that the physical properties gradually change between fcc and face-centered tetragonal structures, and will deepen our understanding of the mechanism of such magnetism in FePt nanoparticles.

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