Field dependent anisotropic magnetoresistance measurements on CoFe/IrMn bilayers

Heather L. Brown, E. Dan Dahlberg, Mark Kief, Chunhong Hou

Research output: Contribution to journalArticlepeer-review


The exchange anisotropy field, along with the qualitative distribution of the local pinning field at the ferromagnetic/antiferromagnetic interface, has been studied in polycrystalline CoFe/IrMn bilayers. The exchange anisotropy was studied using both the anisotropic magnetoresistance (AMR) technique and hysteresis loop measurements. The AMR technique determines a larger value for the exchange anisotropy than the hysteresis loop technique. It is observed that H ea extracted via the AMR technique for the majority of samples shows a quantifiable dependence on the applied measurement field, even at fields much less than the exchange bias measured by hysteresis loop. It is believed that a reversible measurement of the soft dispersive moments takes place at these low fields, and that the field dependence is indicative of a distribution of the local magnetization direction.

Original languageEnglish (US)
Pages (from-to)7415-7417
Number of pages3
JournalJournal of Applied Physics
Issue number10 I
StatePublished - May 15 2002


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