Interisland spacing and angle effects on magnetic reversal in permalloy arrays

H. Koo, C. Krafft, R. D. Gomez

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45° and a maximum at 90°. A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.

Original languageEnglish
Pages (from-to)2559-2561
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2002 Sept
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Bibliographical note

Funding Information:
Manuscript received February 14, 2002; revised May 22, 2002. This work was supported in part by NSF CAREER Award ECS-9984797 and performed in part at the Cornell Nanofabrication Facility (a member of the National Nanofabri-cation Users Network), which is supported by the National Science Foundation under Grant ECS-9731293, Cornell University, and industrial affiliates.


  • Angle
  • Array
  • Coherent rotation
  • Interisland spacing
  • Permalloy
  • Switching field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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