Magnetisation reversal dynamics in Ni80Fe20 thin films

Abstract

The dynamic magnetisation reversal behaviour of polycrystalline Ni80Fe20 films (thickness 60 and 200 Angstrom) was studied in the temperature range 90-300 K. The loop area A is found to follow the scaling relation A proportional to H(0)(x)Omega(beta)T(-gamma) with alpha approximate to 0.9, beta approximate to 0.8, and gamma approximate to 0.38 for both thicknesses. The exponents alpha and beta are found to be independent of the temperature, indicating that the dynamic reversal mechanism is unchanged in this temperature range. (C) 2002 Elsevier Science B.V. All rights reserved.