Fabrication and characterization of Co1−xFex alloy nanowires

Abstract

Co 1−x Fe x alloy nanowires with 40 nm diam and x=0–1.0 were fabricated by electrodeposition in nanopores of alumina templates. The crystalline structure of the nanowires is concentration dependent and shows a transition from the cobalt hexagonal-closed-packed structure (hcp) to a face-centered-cubic structure (fcc) in the concentration range 0<x<0.1. For an iron content greater than 15 at % the structure becomes body-centered-cubic (bcc). The nanowires with an aspect ratio of about 8 show a highly anisotropic magnetization with the easy axis along the length of the wire. The squareness of the hysteresis loops is between 72% and 93% for magnetic fields parallel to the wires while the squareness is less than 13% for fields perpendicular to the wires. The coercivity along the easy axis reaches a maximum of 2150 Oe for x=0.55 and is almost concentration independent for 0.5<x<0.6.

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

“…Magnetic properties of FeCo alloys nanowires can be tuned by adjusting the alloy composition or adding other elements [8][9][10] or by suitable thermal treatments. 11 Particularly, high values of coercivity and remanence have been measured when the magnetic field is applied parallel to the nanowires and have been attributed mainly to the magnetic shape anisotropy.…”

Investigation of magnetic interactions in large arrays of magnetic nanowires

“…The spacing between the nanowires was D i =55 or 95 nm, depending on the templates used. The diameter of the nanowires ranges from 12 to 48 nm, while their length is 12 m. The choice of the Co 0.45 Fe 0.55 alloy was motivated by its nearly zero magnetocrystalline anisotropy, 11 insuring that the properties of individual nanowires are dominated by shape anisotropy.…”

“…11 In brief, Co 0.45 Fe 0.55 alloy nanowires are electrodeposited in porous hexagonally ordered anodic alumina templates prepared using a multistep anodization process. The spacing between the nanowires was D i =55 or 95 nm, depending on the templates used.…”

Zigzag-shaped nickel nanowires via organometallic template-free route

“…Hence, the use of carbonyl precursors should open a way to bimetallic systems. As an example, Ni(COD) 2 and Fe(CO) 5 organometallic precursors should yield bimetallic magnetic wires with interesting magnetic properties (Fodor, et al, 2002). Fe(CO) 5 remains the most readily available precursors for Fe and successfully yields Fe nanoparticles in solution (Park, et al, 2000) (Lacroix, et al, 2011) or as MOCVD precursor (Senocq, et al, 2006).…”