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Magnetization reversal and interlayer coupling in Co50Fe50 nanomagnets V. Satya Narayana Murthy,1
 

Summary: Magnetization reversal and interlayer coupling in Co50Fe50 nanomagnets
V. Satya Narayana Murthy,1
C. Krishnamoorthi,2
R. Mahendiran,2
and A. O. Adeyeye1,a
1
Department of Electrical and Computer Engineering, Information Storage Materials Laboratory,
National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
2
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
Received 23 October 2008; accepted 8 December 2008; published online 28 January 2009
We investigated magnetization reversal mechanism in elliptical shaped nanomagnets made from
single layer and pseudospin valve Co50Fe50 films. The structures were fabricated using deep
ultraviolet lithography and the lift-off process. We observed that the magnetization reversal process
of the single layer elements is strongly dependent on the film thickness. For thickness tCoFe
=10 nm, the magnetization reversal process is dominated by a systematic coherent rotation,
whereas for tCoFe=60 nm, the reversal process is mediated by vortex nucleation, displacement, and
annihilation. By exploiting the thickness dependence of the magnetization reversal process,
pseudospin valve nanomagnets from two Co50Fe50 thicknesses 10 and 60 nm were fabricated. We
also investigated the effect of interlayer exchange coupling in pseudospin valve structures by

  

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

 

Collections: Physics; Materials Science