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29 March 2024
 
  » arxiv » cond-mat/0505459

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Immense tunnel magnetoresistance mediated by Coulomb blockade effect and current-driven magnetization reversal in Co clusters embedded in a TiO2 matrix
J. Varalda ; D. H. Mosca ; Y.-L. Zheng ; A. J. A. de Oliveira ; M. Marangolo ; W. A. Ortiz ; D. Demaille ; B.Vodungbo ; V. H. Etgens ;
Date 18 May 2005
Subject Materials Science | cond-mat.mtrl-sci
AbstractMagnetic and magneto-transport properties of Co nanoclusters embedded in a TiO2-d matrix grown by pulsed laser ablation have been studied. The results show a tunneling magnetoresistance (TMR) as high as 300%, associated with spin-polarized multiple quantum tunneling through the Coulomb energy barrier (Coulomb blockade effect). The interplay between the Coulomb blockade effect and the magnetization reversal driven by spin-polarized tunneling currents has been evidenced to occur concomitantly with a immense variation of the TMR.
Source arXiv, cond-mat/0505459
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