期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 290, 期 -, 页码 1210-1213出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2004.11.387
关键词
shape anistropy; magnetic nanowires; electrodeposition; nanoporous alumina membrane; cobalt
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. © 2004 Elsevier B.V. All rights reserved.
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