Ferromagnetic CoPt3 nanowires: structural evolution from fcc to ordered L1(2).
This investigation demonstrates the magnetic properties and nanostructures of CoPt(3) wire arrays that were fabricated by electrodeposition using a porous alumina template. The X-ray absorption analysis clearly verified the occurrence of a phase transition in CoPt(3) nanowires. This phase transition significantly influences the magnetic properties and enhances coercivity and squareness. The phase transition of CoPt(3) nanowires was from a random alloy distribution to anisotropically ordered CoPt(3) (L1(2)). The thermally induced phase transition of CoPt(3) nanowires to ordered L1(2) CoPt(3) through a "cluster-in-cluster" intermediate state via interdiffusion processes is revealed. The mechanism exhibited by these CoPt(3) nanowires is proposed to explain the strong correlation between their magnetic character and their atomic distribution.
Chen
Hao Ming
HM
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
Hsin
Chia Fen
CF
Chen
Po Yuan
PY
Liu
Ru-Shi
RS
Hu
Shu-Fen
SF
Huang
Chao-Yuan
CY
Lee
Jyh-Fu
JF
Jang
Ling-Yun
LY
D000497:Alloys / Q000737:chemistry*; D005583:Fourier Analysis; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D053770:Nanowires; D014961:X-Ray Diffraction
D000497:Alloys; C477450:cobalt platinum alloy