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Summary: Size-dependent spin-wave frequency in ferromagnetic wire-array structures
A. Ercole, A. O. Adeyeye, J. A. C. Bland, and D. G. Hasko
Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom
Received 28 October 1997
Spin-wave frequency measurements in ferromagnetic FeNi wire-array structures by Brillouin light scattering
BLS are reported. The arrays studied were 600 Å thick and had wire widths of between 0.8 and 10 m, with
separations between wires of twice the width. The spin-wave frequencies were measured in the Voigt geometry
with an external field applied parallel or perpendicular to the wires. A rapid drop in BLS intensity with
decreasing structure size was seen. For the perpendicular field geometry, we observed a decrease in both the
surface and first volume-mode frequencies. We show this to be due to static demagnetizing fields. The parallel
field case showed a rise in frequency of only the surface mode with decreasing wire size, which we demon-
strate to be the effects of oscillating magnetic edge charges. S0163-1829 98 04021-1
I. INTRODUCTION
Recent advanced lithographic and other controlled prepa-
ration techniques have given rise to the possibility of study-
ing magnetism in laterally defined magnetic structures. So
far, work has mainly concentrated on the static magnetic
properties of such structures.13
Developments in micromag-
netic computational techniques3
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