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Magnetization reversal mechanisms in diamond-shaped Co nanomagnets S. Goolaup and A. O. Adeyeye*
 

Summary: Magnetization reversal mechanisms in diamond-shaped Co nanomagnets
S. Goolaup and A. O. Adeyeye*
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 30 November 2005; revised manuscript received 13 February 2006; published 29 March 2006
We investigate the magnetic properties of single layer and pseudo-spin valve Co diamond-shaped nanomag-
nets fabricated using deep ultraviolet lithography. We have performed a systematic investigation of the effect
of film thickness on the magnetization reversal process of single layer Co nanomagnets. We observed that for
t 10 nm, the reversal process is dominated by spin rotation in contrast with vortex nucleation and annihilation
for thicker Co nanostructures. By exploiting the thickness dependence in single layer Co nanomagnets, pseudo-
spin valve nanostructures with two Co layers thickness of distinct switching field separated by a Cu spacer
layer were fabricated. We observed that the multilayer Co nanostructures display unique magnetic properties,
which are greatly influenced by the Cu spacer layer thickness. Our experimental results are in reasonable
agreement with simple micromagnetic simulations.
DOI: 10.1103/PhysRevB.73.104444 PACS number s : 75.60.Jk, 75.30.Gw, 75.75. a
I. INTRODUCTION
Arrays of identical magnetic particles whose geometry,
size, and inter-element spacing can be precisely controlled

  

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

 

Collections: Physics; Materials Science