Perpendicularly self-oriented and shape-controlled L10-FePt nanorods directly synthesized by a temperature-modulated process |
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Authors: | Tiago Luis da Silva Laudemir Carlos Varanda |
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Affiliation: | Colloidal Materials Group, Instituto de Quimica de Sao Carlos, Universidade de Sao Paulo--USP, Sao Carlos, PO Box 780, 13566-590, Brazil |
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Abstract: | The synthesis and self-assembly of tetragonal phase-containing L10-Fe55Pt45 nanorods with high coercive field is described. The experimental procedure resulted in a tetragonal/cubic phase ratio close
to 1:1 for the as-synthesized nanoparticles. Using different surfactant/solvent proportions in the process allowed control
of particle morphology from nanospheres to nanowires. Monodisperse nanorods with lengths of 60 ± 5 nm and diameters of 2–3
nm were self-assembled in a perpendicular oriented array onto a substrate surface using hexadecylamine as organic spacer.
Magnetic alignment and properties assigned, respectively, to the shape anisotropy and the tetragonal phase suggest that the
self-assembled materials are a strong candidate to solve the problem of random magnetic alignment observed in FePt nanospheres
leading to applications in ultrahigh magnetic recording (UHMR) systems capable of achieving a performance of the order of
terabits/in2.
![MediaObjects/12274_2011_122_Fig1_HTML.gif](/content/C72U7160505812H1/MediaObjects/12274_2011_122_Fig1_HTML.gif) |
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Keywords: | Magnetic materials data storage FePt nanorods self-assembl~ perpendicular magnetic alignment |
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