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Magnetostatic interactions and magnetization reversal in ferromagnetic wires A. O. Adeyeye,* J. A. C. Bland, C. Daboo, and D. G. Hasko
 

Summary: Magnetostatic interactions and magnetization reversal in ferromagnetic wires
A. O. Adeyeye,* J. A. C. Bland, C. Daboo, and D. G. Hasko
Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE, United Kingdom
Received 14 August 1996; revised manuscript received 9 December 1996
We have investigated the effect of magnetostatic interactions on the magnetization reversal behavior of
Ni80Fe20 flat wire arrays using magnetoresistance MR measurements. The wires are fabricated from films of
thickness 500 . As the separation s of a wire array of fixed width w 2 m is increased, a crossover from the
behavior characteristic of an interacting wire array to that of a single isolated wire is identified for s/w 1. For
the interacting limit, s/w 1, a marked reduction in the coercive field occurs as the spacing of wires of fixed
width are decreased. The shape of the MR response to fields applied along the hard axis is also found to be
strongly dependent on the interwire separation. We attribute this behavior to the effect of interwire dipolar
interactions. MR measurements were also made as a function of the orientation of the applied field relative to
the axis of the wire, in order to investigate how the shape anisotropy affects the magnetization reversal process.
In m-size wires we find that ``one-jump'' switching of the magnetization can occur according to the orien-
tation of the wires with respect to the applied field. S0163-1829 97 00126-4
I. INTRODUCTION
Studies of the magnetization reversal process and domain
structure in small ferromagnetic elements provide an impor-
tant opportunity to test micromagnetic predictions in new
geometries.16

  

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

 

Collections: Physics; Materials Science