Effect of the Ferromagnetic Layer Thickness on the Blocking Temperature in IrMn/CoFe Exchange Couples

Gonzalo Vallejo Fernandez, B. Kaeswurm, L. E. Fernandez-Outon, K. O'Grady

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In this work we present a study of the thermal stability of IrMn/CoFe exchange couples as a function of the thickness of the ferromagnetic (F) layer t(F). We find a monotonic decrease in the average blocking temperature < T-B > with t(F) of up to 29% for t(F) = 12 nm. We have quantified the effect of the exchange field (H*) from the F layer on the antiferromagnetic (AF) layer and its effect on the thermal stability of the AF. H* can increase the degree of thermal activation by up to 44%.

Original languageEnglish
Pages (from-to)2835-2838
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - Nov 2008


  • Blocking temperature
  • exchange bias
  • IrMn
  • BIAS

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