Thickness-dependent magnetic excitations in Permalloy films with nonuniform magnetization

J. Ben Youssef, N. Vukadinovic, D. Billet, and M. Labrune
Phys. Rev. B 69, 174402 – Published 4 May 2004
PDFExport Citation

Abstract

The static and dynamic properties of Permalloy films with thicknesses varying from 200 nm to 920 nm have been investigated in detail. For these films possessing a perpendicular anisotropy, the critical thickness for stripe domain nucleation has been determined using magnetic force microscopy imaging and in-plane hysteresis loop measurements. The zero-field dynamic permeability spectra measured over the frequency range 0.1–6 GHz reveal one resonance line below the critical thickness, whereas multiple resonance peaks whose number increases with increasing film thickness are observed above the critical thickness. The two-dimensional dynamic micromagnetic simulations reproduce successfully the thickness evolution of the experimental permeability spectra and give access to the thickness-dependent spatial localization of the main modes. However, the experimental resonance linewidths exceed the computed ones for the thickest films. Extended dynamic micromagnetic simulations including the screening of the pumping field due to eddy currents account only partially for resonance line broadening. The existence of additional relaxation mechanisms due to magnetic inhomogeneities (micromagnetic and structural) is discussed on the basis of parallel ferromagnetic resonance measurements versus frequency.

  • Received 25 November 2003

DOI:https://doi.org/10.1103/PhysRevB.69.174402

©2004 American Physical Society

Authors & Affiliations

J. Ben Youssef

  • LMB, CNRS-FRE 2697, UBO, 29285 Brest, France

N. Vukadinovic*

  • Dassault Aviation, 92552 St-Cloud, France

D. Billet and M. Labrune

  • LPMTM, CNRS-UPR 9001, Institut Galilée, Université Paris-13, 93430 Villetaneuse, France

  • *Corresponding author. Email address: nicolas.vukadinovic@dassault-aviation.fr

References (Subscription Required)

Click to Expand
Issue

Vol. 69, Iss. 17 — 1 May 2004

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×