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Magnetic properties of asymmetric antirectangular Ni80Fe20 arrays C. C. Wang, A. O. Adeyeye,a)
 

Summary: Magnetic properties of asymmetric antirectangular Ni80Fe20 arrays
C. C. Wang, A. O. Adeyeye,a)
and Y. H. Wu
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
Received 27 June 2003; accepted 29 August 2003
The magnetic properties of antirectangular arrays (2 10 m2
) embedded into 800 thick
continuous Ni80Fe20 films with interhole spacing s in the range of 26 m have been investigated.
We observed that the presence of the rectangular holes strongly modifies the shape of the magnetic
hysteresis loop compared with continuous film of the same thickness. Specifically, we observed that
the coercivity increases dramatically with the reduction of interhole spacing due to magnetic domain
wall pinning, in agreement with our magnetic force microscopy images. Complex magnetotransport
curves were obtained, which is not readily explained using the conventional anisotropic
magnetoresistance effect. We attribute our results to the contribution by magnetic domains to overall
resistivity of the antirectangular structures. From field angle dependent magnetotransport
measurements, we are able to deduce the pinning strength for different interhole spacing. 2003
American Institute of Physics. DOI: 10.1063/1.1620682
I. INTRODUCTION
The magnetic property of arrays of submicron or nanos-

  

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

 

Collections: Physics; Materials Science