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Magnetic properties of exchange biased Co/CoO elongated nanoring arrays D. Tripathy and A. O. Adeyeyea
 

Summary: Magnetic properties of exchange biased Co/CoO elongated nanoring arrays
D. Tripathy and A. O. Adeyeyea
Department of Electrical and Computer Engineering, Information Storage Materials Laboratory, National
University of Singapore, Singapore 117576, Singapore
Presented 13 November 2008; received 29 August 2008; accepted 18 November 2008;
published online 3 March 2009
We present a systematic study of the magnetic properties of exchange biased
Co 25 nm /CoO tCoO /Cu 2 nm elongated nanoring arrays. The reversal mechanism in the
exchange biased nanorings is directly compared to that of unbiased nanorings of identical geometry
at varying temperatures. We observe that along the field cooling direction, the exchange biased
nanorings exhibit reversal via shifted vortex states with enhanced magnitudes of onionvortex and
vortexreverse onion transition fields. The magnitude of exchange bias field is also found to be
strongly dependent on the CoO layer thickness tCoO, and decreases monotonically with increasing
tCoO. Due to the interplay between the exchange and Zeeman energies, the exchange bias field could
also be varied by adjusting the field cooling strength. 2009 American Institute of Physics.
DOI: 10.1063/1.3072092
There has been an emerging scientific interest in the
magnetization reversal mechanisms of patterned nanomag-
nets with precisely controlled geometry and interelement
spacing1

  

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

 

Collections: Physics; Materials Science