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Magnetic spin states and vortex stability control in elongated Ni80Fe20 Y. Ren and A. O. Adeyeyea
 

Summary: Magnetic spin states and vortex stability control in elongated Ni80Fe20
nanorings
Y. Ren and A. O. Adeyeyea
Department of Electrical and Computer Engineering, Information Storage Materials Laboratory, National
University of Singapore, Singapore 117576, Singapore and Advanced Materials for Micro- and Nano-
Systems, Singapore-MIT Alliance, Singapore
Received 23 January 2009; accepted 5 February 2009; published online 17 March 2009
We present the results of a systematic characterization of the magnetization reversal mechanism of
arrays of elongated Ni80Fe20 nanorings using focused magneto-optical Kerr effect measurements.
The long axis of the rings was varied from 850 nm to 1.60 m while the aspect ratio, ring width,
and thickness were fixed at 2, 150 nm, and 25 nm, respectively. We observed an increase in the
range of stability of the intermediate vortex state with both increasing length l of the ring and
varying field orientations. Interestingly, for l lcrit, the reversal process drastically changes from a
two-step switching to a single step switching without the formation of a vortex state and from a
one-step switching to a double step switching with the formation of a vortex state when the applied
field is 5 away from the easy and hard axes of the ring, respectively. There is a good agreement
between the experimental results and micromagnetic simulations. 2009 American Institute of
Physics. DOI: 10.1063/1.3093894
I. INTRODUCTION
Recently, ferromagnetic nanorings are currently attract-

  

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

 

Collections: Physics; Materials Science