Interface structures in FePt/Fe[sub 3]Pt hard-soft exchange-coupled magnetic nanocomposites

Li, Jing; Wang, Zhong Lin; Zeng, Hao; Sun, Shouheng; Ping Liu, J.
May 2003
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3743
Academic Journal
Self-assembly of FePt and Fe[sub 3]O[sub 4] nanoparticles of different sizes led to various FePt-Fe[sub 3]O[sub 4] nanocomposites. Annealing the composite under reducing atmosphere at 650 and 700 °C induced magnetically hard FePt phase and magnetically soft Fe[sub 3]Pt phase. The FePt and Fe[sub 3]Pt phases were either linked by a common interface or coexisted within one grain as domains with sizes <10 nm. This ensures the effective exchange coupling of magnetically hard and soft phases. High-resolution transmission electron microscopy studies provide detailed structural characterization for the FePt based nanocomposites.


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