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Size-dependent spin-wave frequency in ferromagnetic wire-array structures A. Ercole, A. O. Adeyeye, J. A. C. Bland, and D. G. Hasko
 

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 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

  

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

 

Collections: Physics; Materials Science