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Magnetostatic interactions in mesoscopic Ni80Fe20 ring arrays J. Wang and A. O. Adeyeyea
 

Summary: Magnetostatic interactions in mesoscopic Ni80Fe20 ring arrays
J. Wang and A. O. Adeyeyea
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
National University of Singapore, 4 Engineering Drive 3, Singapore-117576
N. Singh
Institute of Microelectronics, 11 Science Park Road, Singapore Science Park II, Singapore 117685
Received 13 June 2005; accepted 3 November 2005; published online 27 December 2005
We investigate, directly using magnetic force microscopy, the effect of magnetostatic interactions in
arrays of Ni80Fe20 mesoscopic rings. The rings were fabricated on silicon substrate using deep
ultraviolet lithography at 248 nm exposure wavelength. We observed that the transitions from
onion-to-vortex and vortex-to-reverse onion magnetic states are strongly dependent on the
edge-to-edge-spacing of the rings due to dipolar magnetostatic interaction. For a closely packed ring
array, the transition from onion to vortex state occurs at a much lower field due to collective
magnetic switching as compared with widely spaced rings. The remanent magnetic state is found to
be very sensitive to the orientation of the applied field due to shape anisotropy. 2005 American
Institute of Physics. DOI: 10.1063/1.2158488
The magnetic properties of ferromagnetic nanorings are
currently attracting increasing interest both from a funda-
mental viewpoint and their potential applications in magnetic
random access memory MRAM .1

  

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

 

Collections: Physics; Materials Science