Effect of oxidation and annealing on tunnel barrier structure and composition in IrMn/CoFe/TiOx/CoFe magnetic tunnel junctions

Daniel J. Kirk, David J H Cockayne, Amanda K. Petford-Long, Ge Yi

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The effects of oxidation time and annealing conditions on sputter-deposited magnetic tunnel junctions with a TiOx barrier have been investigated. High resolution electron microscopy showed that longer oxidation times led to a significant increase in barrier layer width and to the formation of large volumes of oxides of Co and Fe. Annealing promoted extensive diffusion of Mn to the barrier region and the oxidation of Mn to MnOx concurrent with the reduction in oxides of Co and Fe. Annealing also increased the peak oxygen content of the barrier region and resulted in a distinct asymmetry in the barrier oxide structure.

Original languageEnglish (US)
Article number123915
JournalJournal of Applied Physics
Volume106
Issue number12
DOIs
StatePublished - Dec 1 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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