4.8 Article

Modulation of Magnetic Exchange Coupling via Constructing Bi- or Multimagnetic Heterointerfaces

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出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c02922

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资金

  1. National Natural Science Foundation of China
  2. National Key Research and Development Program of China
  3. Chinese Academy of Sciences
  4. [22177114]
  5. [21778055]
  6. [2018YFA0208800]
  7. [YJKYYQ20210010]

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This study proposes a novel nanotechnology solution to resolve the contradictions between nanoscale size and high saturation magnetization in nanomagnetic materials. The solution involves constructing heterointerfaces of exchange-coupling core-shell nanocrystals to rearrange surface spin and enhance the magnetization. Experimental results demonstrate that constructing coupling heterointerfaces can orientate the overall magnetic moment, ultimately enhancing the magnetization of nanomagnetic materials.
How to resolve contradictions between the nanoscale size and high saturation magnetization (M-s) remains one of the scientific challenges in nanoscale magnetism as the theoretical optimal M-s of nanocrystals is compromised by the surface spin disorder. Here, we proposed a novel nanotechnology solution, heterointerface constructions of exchangecoupling core-shell nanocrystals, to rearrange the surface spin for the enhancement of M-s of nanomagnetic materials. As a demonstration of this principle, single-interface coupling FePt@Fe3-delta O4 core/shell nanocrystals and multi-interface coupling FePt@Fe3-delta O4@MFe2O4 (M = Mn or Co) core/shell/shell nanocrystals were synthesized. The simulated and experimental results demonstrated that constructing coupling heterointerfaces orientates the overall magnetic moment, ultimately enhancing the M-s of nanomagnetic materials. Moreover, this work first demonstrated that the origin of coupling heterointerfaces arose from mismatched lattices rather than chemical composition mismatch at the core-shell interfaces, thus providing both a solution to unite different mechanisms and an explanation to explain the exchange coupling at heterointerfaces.

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