Astroid curves of high-moment antiferromagnetic nanoparticles with tunable magnetic properties

D. M. Forrester, E. Kovacs, K. E. Kürten, F. V. Kusmartsev

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have determined astroids for high-moment antiferromagnetic nanoparticles (AN), which have been recently discovered and used in numerous biomedical applications. The astroid curves for such a system, which is a stack of two isolated disk-shaped ferromagnetic nanoparticles interacting antiferromagnetically, show the regions in the magnetic field plane where different numbers of minima associated with stable or metastable states may exist. We describe the properties of these ANs and estimate their other characteristic parameters such as magnetic saturation field and exchange antiferrtomagnetic coupling. We argue that the finding of these astroids and the properties of ANs is crucial for the use of ANs in numerous applications and for modeling stable information storage devices.

Original languageBritish English
Pages (from-to)903-905
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number7
StatePublished - Apr 2009


  • Disk-shaped magnetic nanoparticle
  • Stoner-Wohlfarth astroid


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