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Magnetic properties of arrays of ``holes'' in Ni80Fe20films A. O. Adeyeye, J. A. C. Bland, and C. Daboo
 

Summary: Magnetic properties of arrays of ``holes'' in Ni80Fe20films
A. O. Adeyeye, J. A. C. Bland, and C. Daboo
Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom
Received 3 January 1997; accepted for publication 9 April 1997
We have studied the magnetization reversal and magnetoresistance behavior in lithographically
defined structures based on a 400 Ni80Fe20 film. The structures consist of square arrays of holes
with size d in the range from 0.5 to 15 m fabricated using electron beam lithography and an
optimized pattern transfer process. For the field applied along the intrinsic easy axis, a marked
increase in the coercive field is observed as the hole size is decreased. This has been attributed to
the pinning of the domain walls in the vicinity of the holes. However, for the field applied along the
intrinsic hard axis direction, there is a marked increase in the remanence as the hole size is reduced
due to the competition between the intrinsic uniaxial anisotropy field and the shape induced
magnetic anisotropy field. Unusual magnetoresistance effects are observed as a function of
orientation of applied field in submicron structures. 1997 American Institute of Physics.
S0003-6951 97 02123-2
Increasing attention is now focused on the magnetic
properties of laterally defined submicron and nanoscale mag-
netic structures. From a technological point of view, arrays
of magnetic structures of nanometer size might be consid-
ered as engineered media for perpendicular recording

  

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

 

Collections: Physics; Materials Science