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Size dependence of the magnetoresistance in submicron FeNi wires A. O. Adeyeye, J. A. C. Bland, C. Daboo, Jaeyong Lee, U. Ebels, and H. Ahmed
 

Summary: Size dependence of the magnetoresistance in submicron FeNi wires
A. O. Adeyeye, J. A. C. Bland, C. Daboo, Jaeyong Lee, U. Ebels, and H. Ahmed
Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE, United Kingdom
The field-dependent magnetoresistance MR characteristic and magnetic hysteresis behavior has
been studied in 300500 thickness Ni80Fe20 wires of variable width (w) in the range from 0.2 to
10 m. As the width of the wire decreases, a marked increase in the easy axis coercive field is seen
for fields applied along the wire axis and the form of the MR characteristic is markedly modified for
the in-plane perpendicular hard axis direction with a large field-dependent MR response observed
for applied field strengths exceeding the edge demagnetizing field. The low field hard axis results
are discussed in terms of an inhomogeneous spin configuration across the width of the wires arising
from the spatial variation of the demagnetizing field. 1996 American Institute of Physics.
S0021-8979 96 77008-7
The size-dependence of the magnetization reversal pro-
cess in submicron structures provides an important opportu-
nity in testing micromagnetic models and in exploring mag-
netoresistance effects associated with the modified spin
ordering arising from the reduced dimensions. Advances in
fabrication techniques based on advanced electron lithogra-
phy together with recent developments in micromagnetic
computational techniques have opened new perspectives in

  

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

 

Collections: Physics; Materials Science