Magnetization reversal in magnetostatically coupled dot arrays

H. Shima, K. Yu Guslienko, V. Novosad, Y. Otani, K. Fukamichi, N. Kikuchi, O. Kitakami, Y. Shimada

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The submicron permalloy dots with variable diameter and interdot distance were microfabricated into a rectangular lattice by means of e-beam lithography and lift-off techniques. The hysteresis loops exhibit characteristic magnetization reversal accompanied by "nucleation" and "annihilation" of magnetic vortices inside the dots. The magnetic response of the samples with well-separated elements is isotropic in the plane. The arrays with a small interdot distance show magnetic anisotropy with the easy axis along the shortest period in the array. This anisotropy is originated from the interdot magnetostatic interaction. In the closely packed (when interdot distance is smaller than dot radius) arrays so that d/R<1, the magnetostatic interaction decreases the vortex nucleation and annihilation fields, and increases the initial susceptibility.

Original languageEnglish
Pages (from-to)6952-6954
Number of pages3
JournalJournal of Applied Physics
Issue number10 I
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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