Enhanced Structural and Magnetic Coupling in a Mesocrystal-Assisted Nanocomposite

Yuanmin Zhu, Qian Zhan*, Jan Chi Yang, Yugandhar Bitla, Pingping Liu, Chen I. Li, Heng Jui Liu, V. Suresh Kumar, Elke Arenholz, Qing He, Ying-hao Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Benefiting from the advances made in well-controlled materials synthesis techniques, nanocomposites have drawn considerable attention due to their enthralling physics and functionalities. In this work, we report a new heteroepitaxial mesocrystal-perovskite nanocomposite, (NiFe 2 O 4 ) 0.33 :(La 0.67 Ca 0.33 MnO 3 ) 0.67 . Elaborate structural studies revealed that tiny NiFe 2 O 4 nanocrystals aggregate into ordered octahedral mesocrystal arrays with {111} facets together with a concomitant structural phase transition of the La 0.67 Ca 0.33 MnO 3 matrix upon postannealing process. Combined magnetic and X-ray absorption spectroscopic measurements show significant enhancement in the magnetic properties at room temperature due to the structural evolution of magnetic NiFe 2 O 4 and the consequent magnetic coupling at the heterointerfaces mediating via well connected octahedrons of Mn-O 6 in La 0.67 Ca 0.33 MnO 3 and (Ni,Fe)-O 6 in NiFe 2 O 4 . This work demonstrates an approach to manipulate the exciting physical properties of material systems by integrating desired functionalities of the constituents via synthesis of a self-assembled mesocrystal embedded nanocomposite system.

Original languageEnglish
Pages (from-to)1104-1111
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number2
DOIs
StatePublished - 20 Jan 2016

Keywords

  • heterointerfaces
  • magnetic coupling
  • mesocrystal
  • self-assembled nanocomposite
  • structural evolution

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