Oscillations of the ferromagnetic resonance linewidth and magnetic phases in Co/Ru superlattices

W. Alayo, E. Baggio-Saitovitch, F. Pelegrini, and V. P. Nascimento
Phys. Rev. B 78, 134417 – Published 22 October 2008

Abstract

The interlayer exchange coupling (IEC) and the magnetic anisotropy of Co/Ru(0002) hcp superlattices, produced by magnetron sputtering, were studied by ferromagnetic resonance (FMR). The main mode and a secondary mode, with a higher resonance field, were identified in the perpendicular FMR spectra. The secondary mode is attributed to the resonance of the bulk of Co magnetic layers while the main mode is associated with the Co/Ru interfacial phase. The linewidth dependence of the main FMR mode on the Ru thickness clearly reproduces the oscillations of the IEC between Co layers. These oscillations are attributed to the effects of lateral inhomogeneities of the IEC strength and have a period of about 12Å. Moreover, they are in good agreement with magnetoresistance and magnetization measurements performed in the same samples. The dependence of the effective anisotropy constants on the Co layer thickness leads to the volume and surface anisotropy constants of KV=1.10×107erg/cm3 and 2Ks=0.95erg/cm2, respectively, and also to a critical Co thickness of approximately 9Å below which the magnetization is oriented perpendicular to the plane of the film.

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  • Received 5 November 2007

DOI:https://doi.org/10.1103/PhysRevB.78.134417

©2008 American Physical Society

Authors & Affiliations

W. Alayo and E. Baggio-Saitovitch

  • Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro 22290-180, Brazil

F. Pelegrini

  • Instituto de Física, Universidade Federal de Goiás, Goiânia 74001-970, Brazil

V. P. Nascimento

  • Centro Universitário Norte do Espírito Santo, Universidade Federal do Espírito Santo, São Mateus 29933-415, Brazil

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Issue

Vol. 78, Iss. 13 — 1 October 2008

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