Influence of aspect ratio and anisotropy distribution in ordered CoNi nanowire arrays

The size effects on magnetic properties of nanowires arrays were studied varying the nanowires diameter and maintaining the same periodicity among them, for two different nominal compositions of Co and Ni in the alloy form. The competition among magnetocrystalline and shape anisotropies changes dras...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-11, Vol.324 (22), p.3679-3682
Main Authors: Rosa, W.O., Vivas, L.G., Pirota, K.R., Asenjo, A., Vázquez, M.
Format: Article
Language:English
Subjects:
Anisotropy
Anodic alumina membrane
Arrays
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CoNi alloy
Exact sciences and technology
Magnetic nanostructure
Magnetic properties
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetism
Magnetization process
Nanocomposites
Nanomaterials
Nanostructure
Nanowires
Nickel base alloys
Ordered nanowire array
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The size effects on magnetic properties of nanowires arrays were studied varying the nanowires diameter and maintaining the same periodicity among them, for two different nominal compositions of Co and Ni in the alloy form. The competition among magnetocrystalline and shape anisotropies changes drastically from smallest to biggest diameters altering the easy axis direction. In the case of 75% of Co in alloy, experimental values of the effective anisotropy constant (Keff) vary from positive to negative depending on the diameter, which means a reversal of the easy axis direction. For 50% of Co the shape anisotropy dominates over the magnetocrystalline for all studied diameters. ► Highly ordered CoNi nanowire alloys have been produced by electrodeposition. ► Electrolyte temperature ensures the deposition of CoNi alloys instead of Co and Ni segregated. ► A competition between shape and magnetocrystalline anisotropies determines the direction of the easy magnetization axis. ► Analysis of the effective anisotropy gives us information respect to the easy axis modification.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2012.05.047