Open AccessEffects of applied magnetic field on microstructure and magnetic properties of template-based Co nanowire arrays
Author(s) -
Liu Wen-Bang,
Meng Wei-min,
Lou Yuan-Fu,
Xi Liu,
Luran Zhang,
Zheng Xin-Qi,
Fulin Wei
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.7988
Subject(s) - nanowire , materials science , coercivity , magnetization , anisotropy , magnetic anisotropy , electrolyte , condensed matter physics , microstructure , magnetic field , nanotechnology , electrode , composite material , optics , chemistry , physics , quantum mechanics
Arrays of Co nanowires were fabricated by ac electrochemical deposition of metal into high order anodic alumina templates prepared through two-step oxidation method. The effects of applied magnetic field and the pH value of the electrolyte on growth of nanowires were investigated. Arrays of Co nanowires of hcp structure were deposited in the electrolyte whose pH values are 6.0 and 6.5 without magnetic field, then 0.3 T magnetic field was applied along the long axis of nanowires. The experimental results show that external magnetic field and adjustment of pH value of the electrolyte impel the easy magnetization axis of the hcp Co grain to grow along length direction of nanowires. The Co nanowire arrays show higher perpendicular anisotropy, larger coercivity and high M/Ms because the superposition of the crystal anisotropy of hcp Co grains and shape anisotropy of nanowire along length direction.