https://doi.org/10.1140/epjb/e2005-00122-7
Transition from coherent rotation to curling mode reversal process in ferromagnetic nanowires
1
Information Storage Materials Laboratory, Department of Electrical and
Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
2
Institute of Microelectronics, 11 Science Park Road, Singapore Science Park II, Singapore 117685, Singapore
Corresponding author: a eleaao@nus.edu.sg
Received:
2
November
2004
Revised:
24
January
2005
Published online:
20
April
2005
We have investigated the evolution in the magnetization reversal mechanism of lithographically defined Ni80Fe20 nanowire arrays with varied film thicknesses. The nanowire array of width 185 nm and spacing 35 nm were fabricated using deep ultraviolet lithography at 248 nm exposing wavelength. We observed a cross-over from coherent rotation to curling reversal mode when the thickness to width ratio ≥ 0.5. We have aided our understanding of the reversal process with theoretical modeling. A marked increase in the coercive field characterized the intermediate region between coherent rotation and magnetization curling.
PACS: 75.30.Gw – Magnetic anisotropy / 75.60.Jk – Magnetization reversal mechanisms / 75.75.+a – Magnetic properties of nanostructures
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005