Influence of the electrodeposition potential on the crystallographic structure and effective magnetic easy axis of cobalt nanowires

• Main Authors: Irshad, M.I., Mohamed, N.M., Abdullah, M.Z., Saheed, M.S.M., Mumtaz, A., Yasar, M., Yar, A., Zeeshan, M.A., Sort, J.
• Format: Article
• Published: Royal Society of Chemistry 2016
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957556480&doi=10.1039%2fc6ra01311b&partnerID=40&md5=1298451596dd2ebfdf44aef920046789; http://eprints.utp.edu.my/30971/

Cobalt nanowires (NWs) have been synthesized by electrodeposition inside the pores of anodized aluminium oxide templates, at different values of applied deposition potential. The as-deposited NWs are parallel to one another and exhibit a high geometrical aspect ratio. The crystal structure of these NWs shows a strong dependence on the applied deposition potential during synthesis. X-ray diffraction indicates the predominance of hexagonal-closed-packed (HCP) phase with (002) texture at low applied deposition potentials, whereas a reorientation of the c-axis of the HCP structure is observed for high electrodeposition potentials. Moreover, for a given electrodeposition time, the length of the NWs also increases with the applied potential. As a result of these structural changes, a switch in the magnetic easy axis, from parallel to perpendicular to the NW axis, occurs depending on the applied potential. A simplified model is used to account for this reorientation of the effective magnetic anisotropy direction, which takes into account the interplay between shape anisotropy, magnetocrystalline anisotropy and interwire dipolar interactions. © 2016 The Royal Society of Chemistry.