Field sweep rate dynamics in magnetic tunnel junctions

J. Moritz, C. Ó Coileáin, G. Feng, K. Nakajima, S. van Dijken*, J. M D Coey

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


The dynamical behavior of magnetic tunnel junctions (MTJs) was investigated by varying the magnetic field sweep rate from 0.01 mT/s to 10 T/s in a magneto optical Kerr effect set-up. The bias fields of the pinned and free ferromagnetic electrodes were found to drastically decrease above a field sweep rate of 1 T/s. This decrease in the bias fields coincides with a change in the magnetization reversal process from domain wall motion at low-field sweep rates to domain nucleation at high-field sweep rates. The nucleation of inverse domains in the ferromagnetic layer changes the interfacial spin structure of the antiferromagnetic layer and therefore the magnitude of the exchange bias effect. Furthermore, the nucleation of domains induces a discontinuous magnetic charge density at the tunnel barrier interfaces and this reduces the interlayer coupling between the two ferromagnetic electrodes of the MTJ.

Original languageEnglish
Pages (from-to)118-123
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Issue number2
Publication statusPublished - Jan 2006
MoE publication typeA1 Journal article-refereed


  • Dynamics
  • Exchange bias
  • Magnetic hysteresis
  • Magnetic tunnel junctions


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