Magnetic properties of self-assembled Co nanowires of varying length and diameter

Authors

H. Zeng, University of Nebraska - Lincoln
M. Zheng, University of Nebraska - Lincoln
Ralph Skomski, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow
Yi Liu, University of Nebraska-LincolnFollow
L. Menon, University of Nebraska - Lincoln
Supriyo Bandyopadhyay, University of Nebraska-LincolnFollow

Date of this Version

5-1-2000

Comments

Published by American Institute of Physics. J. Applied Physics 87, 4718 (2000). ©2000 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

Ferromagnetic Co nanowires have been electrodeposited into self-assembled porous anodic alumina arrays. Due to their cylindrical shape, the nanowires exhibit perpendicular anisotropy. The coercivity, remanence ratio, and activation volumes of Co nanowires depend strongly on the length, diameter, and spacing of the nanowires. Both coercivity and thermal activation volume increase with increasing wire length, while for constant center-to-center spacing, coercivity decreases and thermal activation volume increases with increasing wire diameter. The behavior of the nanowires is explained qualitatively in terms of localized magnetization reversal.