Magnetisation reversal dynamics in Ni80Fe20 thin films

Abstract The dynamic magnetisation reversal behaviour of polycrystalline Ni 80 Fe 20 films (thickness 60 and 200 A) was studied in the temperature range 90–300 K. The loop area A is found to follow the scaling relation A∝H 0 α Ω β T −γ with α ≈0.9, β ≈0.8, and γ =0.38 for both thicknesses. The exponents α and β are found to be independent of the temperature, indicating that the dynamic reversal mechanism is unchanged in this temperature range.