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Epitaxial growth micro-structure and magnetic studies of FePt nanoparticles:MgO multi-layer composite thin films

Wu Jian-Bang Zhou Min-Jie Wang Xue-Min Wang Yu-Ying Xiong Zheng-Wei Cheng Xin-Lu Marie-José Casanove Christophe Gatel Wu Wei-Dong

Epitaxial growth micro-structure and magnetic studies of FePt nanoparticles:MgO multi-layer composite thin films

Wu Jian-Bang, Zhou Min-Jie, Wang Xue-Min, Wang Yu-Ying, Xiong Zheng-Wei, Cheng Xin-Lu, Marie-José Casanove, Christophe Gatel, Wu Wei-Dong
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  • Received Date:  26 February 2014
  • Accepted Date:  14 April 2014
  • Published Online:  05 August 2014

Epitaxial growth micro-structure and magnetic studies of FePt nanoparticles:MgO multi-layer composite thin films

  • 1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;
  • 2. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610064, China;
  • 3. Centre d'Elaboration de Matériaux et d'Etudes Structurales, CNRS, Toulouse 31055, France

Abstract: The FePt:MgO multi-layer nanocomposite thin films are deposited on MgO (100) substrates by using pulsed laser deposition method. The composition of FePt is Fe48Pt52. FePt nanoparticles (NPs) are embedded in MgO epitaxial layer periodically. The results of in-situ reflection high energy electron diffraction show that MgO epitaxial layers grow into the layer-by-layer mode and FePt NPs grow into the island mode. The alternation of the two growth modes is achieved in the whole deposition process. The high resolution transmission electron microscope results show that the phase of FePt is converted from the disordered face-centered cubic structure into the ordered face-centered tetragonal L10 structure after annealing. The perfect crystalline FePt NPs (around 5 nm in diameter) are flat-hexagonal in shape and array layer by layer on MgO matrix. The M-H loop of the film shows that the ordering degree and magnetism are enhanced after annealing.

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