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

Autor(es)

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

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: NANO RESEARCH; v. 4, n. 7, p. 666-674, JUL 2011.
• Citações Web of Science: 10

Resumo

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)

• Processo FAPESP: 08/07568-4 - Nanobastões magnéticos baseados em FePt: síntese, caracterização e auto-organização visando aplicação em gravação magnética de ultra-alta densidade.
• Beneficiário: Tiago Luis da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/07919-9 - Nanocristais magnéticos coloidais: obtenção de nanoesferas, nanofios e nanobastões auto-organizados e funcionalizados com macromoléculas para aplicação em gravação magnética avançada, biotecnologia e biomedicina
• Beneficiário: Laudemir Carlos Varanda
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores