Bi-stable and tri-stable Magnetic domain reconfigurations of a small permalloy pattern using current pulses

H. C. Koo, R. D. Gomez

Research output: Contribution to journalArticle


Realization of pulsed-current selectable domain configurations of small permalloy islands is reported. In the islands with 65-100 nm thickness and micron-sized lateral dimensions, the magnetic domain pattern can be uniquely set into either a four or seven closure domain configuration by applying either a positive or negative 10 ns current pulse at the density of 107 A/cm2. The transition is completely reversible. This phenomenon appears to belong to a family of current-induced magnetization reordering, whose main mechanism appears to be domain wall motion due to s-d exchange force directed along the electron flow, and partially influenced by the Amperian field produced at the contact regions. This paper presents two cases, namely, bi-stable and tri-stable configurations, and discusses the mechanism as well as power requirements in using this approach for memory device applications.

Original languageEnglish
Pages (from-to)272-276
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Issue number2
Publication statusPublished - 2006 Nov 1



  • Bi-stable
  • Current pulse
  • Domain configuration
  • Tri-stable

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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