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. 2006 Feb 21;103(9):3023–3027. doi: 10.1073/pnas.0508877103

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© 2006 by The National Academy of Sciences of the USA

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Fig. 4. — Thermally induced assembly phase transformation from soft–soft Fe₃O₄ and Co binary superlattices to soft–hard core–shell type Fe₃O₄@CoFe₂O₄ nanoparticle superlattices with enhancement in ferrimagnetism. (A and B) TEM images of as-assembled (A) and annealed (B) AB type superlattices. After thermal annealing processes at 400°C, the structural integrity of the superlattices is retained, whereas intercalated Co nanoparticles in as-assembled binary superlattices disappear. (C and D) Hysteresis loops of as-assembled (C) and annealed (D) AB type superlattices. After thermal treatment, a dramatic enhancement (≈25 times) in magnetic coercivity is observed.