Oriented cobalt nanowires prepared by electrodeposition in a porous membrane

Porous alumina membranes with a uniform pore size of 100 nm have been used to prepare arrays of oriented cobalt nanowires by electrodeposition in an applied magnetic field. The hexagonal c-axis lies in the plane of the membrane, perpendicular to the nanowire axis, for material deposited in 0 T or 1....

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-04, Vol.290, p.1210-1213
Main Authors: Chaure, N.B., Stamenov, P., Rhen, F.M.F., Coey, J.M.D.
Format: Article
Language:English
Subjects:
Cobalt
Electrodeposition
Magnetic nanowires
Nanoporous alumina membrane
Shape anistropy
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Summary:Porous alumina membranes with a uniform pore size of 100 nm have been used to prepare arrays of oriented cobalt nanowires by electrodeposition in an applied magnetic field. The hexagonal c-axis lies in the plane of the membrane, perpendicular to the nanowire axis, for material deposited in 0 T or 1.5 T, but in 5 T the c-axis lies at about 70° to the axes of the wires. The degree of field-induced crystallographic orientation is insufficient to overcome the macroscopic demagnetizing field in samples with a large volume fraction of cobalt. The effective demagnetizing factors perpendicular and parallel to the plane of the membrane are N eff ⊥ = 0.7 and N eff ∥ = 0.15 , respectively. Pole figures of the vector magnetization measured in a small rotating field of fixed amplitude in a permanent-magnet vector vibrating sample magnetometer are used to deduce torque and hence the effective magnetocrystalline anisotropy.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.11.387