SpringerOpen Newsletter

Receive periodic news and updates relating to SpringerOpen.

Open Access Nano Express

Synthesis of High Coercivity Core–Shell Nanorods Based on Nickel and Cobalt and Their Magnetic Properties

TN Narayanan1, MM Shaijumon2, PM Ajayan2 and MR Anantharaman1*

Author Affiliations

1 Department of Physics, Cochin University of Science & Technology, Cochin, 22, Kerala, India

2 Department of Mechanical Engineering & Materials Science, Rice University, Houston, TX, USA

For all author emails, please log on.

Nanoscale Research Letters 2009, 5:164-168  doi:10.1007/s11671-009-9459-7

Published: 21 October 2009


Hybrid magnetic nanostructures with high coercivity have immense application potential in various fields. Nickel (Ni) electrodeposited inside Cobalt (Co) nanotubes (a new system named Ni @ Co nanorods) were fabricated using a two-step potentiostatic electrodeposition method. Ni @ Co nanorods were crystalline, and they have an average diameter of 150 nm and length of ~15 μm. The X-ray diffraction studies revealed the existence of two separate phases corresponding to Ni and Co. Ni @ Co nanorods exhibited a very high longitudinal coercivity. The general mobility-assisted growth mechanism proposed for the growth of one-dimensional nanostructures inside nano porous alumina during potentiostatic electrodeposition is found to be valid in this case too.

Magnetic nanowires; Nanorods; Hybrid nanostructures; Core–shell nanostructures; Mobility-assisted growth mechanism