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.
|Number of pages||5|
|Journal||Journal of the Korean Physical Society|
|Publication status||Published - 2001 Aug|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)