Mesoscopic thin-film magnetic rings (invited)

C. A. Ross*, F. J. Castano, D. Morecroft, W. Jung, Henry I. Smith, T. A. Moore, T. J. Hayward, J. A C Bland, T. J. Bromwich, A. K. Petford-Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


The magnetic properties and magnetoresistance of thin-film circular and elliptical magnetic rings made from Co, NiFe, NiFeFeMn, and CoCuNiFe have been explored. Single-layer rings show stable onion and vortex states and metastable twisted states containing a 360° wall. For NiFe rings, four-point magnetotransport results can be explained quantitatively by anisotropic magnetoresistance. NiFeFeMn exchange-biased rings show offset hysteresis loops, and the easy axis is determined by a combination of the ring ellipticity and the exchange coupling. In CoCuNiFe multilayer rings the behavior is dominated by the magnetostatic coupling between the domain walls in the Co and NiFe. In the major loop the giant magnetoresistance varies between three distinct levels corresponding to combinations of onion and vortex states in the NiFe and Co layers.

Original languageEnglish (US)
Article number08S501
JournalJournal of Applied Physics
Issue number8
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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