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Micromagnetics of derivative ring-shaped nanomagnets N. Singh,1,2 S. Goolaup,2 W. Tan,2 A. O. Adeyeye,2,
 

Summary: Micromagnetics of derivative ring-shaped nanomagnets
N. Singh,1,2 S. Goolaup,2 W. Tan,2 A. O. Adeyeye,2,
* and N. Balasubramaniam1
1Institute of Microelectronics, 11 Science Park Road, Singapore Science Park II, Singapore 117685, Singapore
2Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore,
4 Engineering Drive 3, Singapore 117576, Singapore
Received 13 November 2006; revised manuscript received 7 February 2007; published 12 March 2007
We present a systematic investigation of the magnetization reversal process in derivative ring-shaped nano-
magnets. As the transition from onion to vortex state in magnetic rings is through the displacement of the
domain wall along the circumference of the ring, we have investigated the effect of removing different
segments of the ring structure on the magnetization reversal processes. We observed that the magnetic spin
configuration is strongly influenced by the axis that is removed, as confirmed by the magnetic force micros-
copy studies. Our understanding of the reversal process was aided using micromagnetic simulations, which are
in very good agreement with experimental results.
DOI: 10.1103/PhysRevB.75.104407 PACS number s : 75.75. a, 75.60.Jk, 75.60. d
I. INTRODUCTION
There is a growing interest in both the experimental and
theoretical studies of magnetization reversal mechanisms in
patterned nanomagnets due to their potential application in a
wide range of magnetoelectronic devices such as read head

  

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

 

Collections: Physics; Materials Science