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      Patterned Magnetic Recording Media

      Annual Review of Materials Research

      Annual Reviews

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          A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys

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            Thermal Fluctuations of a Single-Domain Particle

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              Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices

              Synthesis of monodisperse iron-platinum (FePt) nanoparticles by reduction of platinum acetylacetonate and decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine stabilizers is reported. The FePt particle composition is readily controlled, and the size is tunable from 3- to 10-nanometer diameter with a standard deviation of less than 5%. These nanoparticles self-assemble into three-dimensional superlattices. Thermal annealing converts the internal particle structure from a chemically disordered face-centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies. These assemblies are chemically and mechanically robust and can support high-density magnetization reversal transitions.
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                Author and article information

                Journal
                Annual Review of Materials Research
                Annu. Rev. Mater. Res.
                Annual Reviews
                1531-7331
                1545-4118
                August 2001
                August 2001
                : 31
                : 1
                : 203-235
                10.1146/annurev.matsci.31.1.203
                © 2001

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