Eur. Phys. J. B 13, 445-450 (2000)
https://doi.org/10.1007/s100510050056

Magnetization dynamics and relaxation in epitaxial FePd thin films with a stripe domain structure

¹ Dassault Aviation, 92552 Saint-Cloud, France
² Laboratoire de Physique du Solide de Bellevue, CNRS, 92195 Meudon, France
³ CEA-Grenoble, Département de Recherche Fondamentale sur la Matière Condensée/SP2M, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
⁴ LTPCM, ENSEEG, B.P.75, 38042 Grenoble, France

Received: 19 February 1999
Revised: 24 June 1999
Published online: 18 October 2012

Abstract

FMR investigations on epitaxial partially ordered FePd thin films with a perpendicular magnetic anisotropy (PMA) are presented. The measurements have been performed over a wide frequency range (6-18 GHz) in the multidomain state where a weak-stripe domain structure exists. Parallel FMR measurements exhibit three magnetic excitations. Their dispersion curves, frequency versus resonance field, and the frequency dependence of the related resonance linewidths are reported. It is shown that the resonance fields and linewidths increase with frequency. For the two main modes identified with domain modes, these behaviors are correctly described by the Domain Mode Ferromagnetic Resonance (DM-FMR) model. Especially, the DM-FMR field-swept linewidth expressions assuming a Landau- Lifshitz-Gilbert-type relaxation have been derived and compared satisfactorily with the experimental data. The physical origin of the third excitation is discussed in terms of domain wall and spin-wave modes.