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Finite size effects in the static and dynamic magnetic properties of FeNi wire array structures

Summary: Finite size effects in the static and dynamic magnetic properties
of FeNi wire array structures
A. Ercole,a)
A. O. Adeyeye, C. Daboo, J. A. C. Bland, and D. G. Hasko
PCS Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom
We report on systematic studies of both the static and dynamic properties of FeNi wire arrays on
GaAs 001 substrates. The wires were between 0.4 and 10 m wide and were separated by twice
their width. The static magnetic properties were investigated using magneto optical Kerr effect
magnetometry. The dynamical magnetic properties spin-waves were investigated by Brillouin
light scattering in the Voigt geometry. With an external field applied along the hard shape axis, the
saturation field was observed to increase and the spin-wave energies decreased with decreasing wire
size. For fields applied along the easy axis of the wire, we observed an increase in the coercive
field as the width of the wire is decreased. The frequency of the surface mode was found to increase
with decreasing wire size while the first volume mode frequency was found to be wire size
independent. 1997 American Institute of Physics. S0021-8979 97 62708-5
Recent advances in lithography and pattern transfer tech-
niques permit the fabrication of laterally structured magnetic
elements, so allowing the study of finite lateral size effects.
So far, efforts have focused on determining the static mag-


Source: Adeyeye, Adekunle - Department of Electrical and Computer Engineering, National University of Singapore


Collections: Physics; Materials Science