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Magnetization process of a single chain of nanomagnets A. O. Adeyeyea)
 

Summary: Magnetization process of a single chain of nanomagnets
A. O. Adeyeyea)
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
4 Engineering Drive 3, National University of Singapore 117576
M. E. Welland
Nanoscale Science Laboratory, Department of Engineering, University of Cambridge, CB2 1PZ,
United Kingdom
Received 16 July 2001; accepted for publication 29 January 2002
We have investigated the magnetization reversal process of a single chain of identical nanomagnetic
dots fabricated from 30 nm thick Ni80Fe20 . The structures consist of two 5 m wide support wires
bridged with a single chain of identical dots of diameter in the range 100250 nm. For fields
applied perpendicular to the single chain, we observed an unusual size dependent hysteretic
behavior in the magnetoresistance curve at high field. This is due to the magnetostatic interaction
arising from the proximity of the magnetic charges. We are able to deduce from a simple
micromagnetic simulation that the reversal process in the chain of dots with 100 nm is mediated
by a collective process of nearly coherent spin rotation. The magnetotransport measurements along
the chain reveal a complex magnetization reversal process in the chain of nanomagnets. 2002
American Institute of Physics. DOI: 10.1063/1.1464662
The recent advances in lithographic and other controlled
fabrication techniques, now allow materials to be patterned

  

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

 

Collections: Physics; Materials Science