Perpendicularly self-oriented and shape-controlled L1(0)-FePt nanorods directly synthesized by a temperature-modulated process

Author(s)

da Silva, Tiago Luis ^[1] ; Varanda, Laudemir Carlos ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Colloidal Mat Grp, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: NANO RESEARCH; v. 4, n. 7, p. 666-674, JUL 2011.
• Web of Science Citations: 10

Abstract

The synthesis and self-assembly of tetragonal phase-containing L1(0)-Fe(55)Pt(45) 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/in(2). (AU)

• FAPESP's process: 08/07568-4 - FePt-based magnetic nanorods: synthesis, characterization, and self-assembling for ultrahigh-density magnetic recording application.
• Grantee: Tiago Luis da Silva
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 07/07919-9 - Colloidal magnetic nanocrystals: synthesis of self-assembled and macromolecules-functionalised nanospheres, nanowires, and nanorods for advanced magnetic recording, biotechnological, and biomedical applications
• Grantee: Laudemir Carlos Varanda
• Support Opportunities: Research Grants - Young Investigators Grants