Spin dynamics and magnetic anisotropy dispersion in soft ferromagnetic thin films

D. Spenato; A. Fessant; J. Gieraltowski; C. Tannous; S. Pogossian; H. Le Gall

doi:doi:10.1051/jp4:1998260

Issue		J. Phys. IV France Volume 08, Number PR2, June 1998 Soft Magnetic Materials 13


Page(s)		Pr2-253 - Pr2-256
DOI		https://doi.org/10.1051/jp4:1998260

Soft Magnetic Materials 13

J. Phys. IV France 08 (1998) Pr2-253-Pr2-256
DOI: 10.1051/jp4:1998260

Spin dynamics and magnetic anisotropy dispersion in soft ferromagnetic thin films

D. Spenato¹, A. Fessant¹, J. Gieraltowski¹, C. Tannous¹, S. Pogossian² and H. Le Gall²

¹ Université de Bretagne Occidentale, Faculté des Sciences, Laboratoire d'Étude des Matériaux, Brest, France
² CNRS, Laboratoire de Physique du Solide, Meudon, France

Abstract
An analytic calculation of the permeability frequency spectra using the LANDAU-LIFSHITZ theory is compared with experimental results obtained of ferromagnetic thin films with an in-plante uniaxial magnetic anisotropy. The disagrement between theory and experiment is attributed to magnetic anisotropy dispersion in the film. This dispersion is studied and seems to be due to magnetic ripples. Measurement of the ripple effect is done through the measurement of the transverse biased susceptibility. A quantitative evaluation of the anisotropy dispersion is suggested in order to improve our model.