Magnetization reversal dynamics in mesoscopic Ni80Fe20 dots

W. Y. Lee, K. H. Shin, B. C. Choi, J. A.C. Bland

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Abstract

The magnetization reversal dynamics in permalloy dots (20 ∼ 400 μm diameter) has been investigated as a function of the applied field amplitude H0 and frequency Ω using scanning Kerr microscopy. An increase in the dynamic coercivity with reduced size is observed for d < 100 μm in the frequency range up to 800 Hz. The loop area A follows the scaling relation A ∝ Hα0Ωβ, with α ≈ 0.14 and β ≈ 0.50 throughout the entire size range studied. These results demonstrate that the dynamic scaling behavior is universal even though the lateral size influences the domain structure and magnetic reversal behavior.

Original languageEnglish
Pages (from-to)350-354
Number of pages5
JournalJournal of the Korean Physical Society
Volume39
Issue number2
Publication statusPublished - 2001 Aug 1

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lee, W. Y., Shin, K. H., Choi, B. C., & Bland, J. A. C. (2001). Magnetization reversal dynamics in mesoscopic Ni80Fe20 dots. Journal of the Korean Physical Society, 39(2), 350-354.