Slow magnetization dynamics of small permalloy islands

H. Koo, T. V. Luu, R. D. Gomez, V. V. Metlushko

Research output: Contribution to journalConference articlepeer-review

21 Citations (Scopus)


The conditions that lead to specific domain configurations and the associated switching characteristics of small permalloy islands were studied by using magnetic force microscopy. By measuring a large number of particles, it was established that islands that have nonzero remanent moments (nonsolenoidal) exist in one of three distinct configurations, namely: (a) true single domain, (b) quasisingle domain with edge closure patterns, and (c) multidomain with nonuniform internal magnetization. The configuration depended upon the island width as well as the aspect ratio. Islands that are 310 nm wide or less are true single domain particles at low aspect ratios (∼1.87) and higher, while islands wider than 500 nm always exhibited edge closure domains even for very large aspect ratios. In the range between 310 and 500 nm, the onset of single domain behavior was a function of the aspect ratio and thickness. Our studies involving in situ applied field similarly revealed the mechanisms of the reversal processes for each of the configurations, which correlated quite well with the values of the switching fields.

Original languageEnglish
Pages (from-to)5114-5116
Number of pages3
JournalJournal of Applied Physics
Issue number9 II
Publication statusPublished - 2000 May
Event44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States
Duration: 1999 Nov 151999 Nov 18

ASJC Scopus subject areas

  • General Physics and Astronomy


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