Ferromagnetic resonance study of structure and relaxation of magnetization in NiFe/Ru superlattices

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:350

Article

Alayo, W.¹  Landi, S., Jr.²  Pelegrini, F.³  Baggio-Saitovitch, E.⁴ 

[1] Univ Fed Pelotas, Dept Fis, BR-96010900 Pelotas, RS, Brazil

[2] Inst Fed Goiano, BR-75901970 Rio Verde, Brazil

[3] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil

[4] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil

关键词: Magnetic superlattices;    Ferromagnetic resonance;    Two-Magnon Scattering;   

DOI  :  10.1016/j.jmmm.2013.09.033

来源: Elsevier

【 摘 要 】

The structural properties and relaxation processes of magnetization in [Ni81Fe19(t(1))/Ru(t(2))](N) superlattices (N = number of bilayers) were analyzed by ferromagnetic resonance (FMR) with a fixed microwave frequency. One series of samples was deposited with constant NiFe layer thickness (t(1)) and variable Ru layer thickness (t(2)); the other series, with constant t(2) and variable t(1). A single FMR mode was observed for t(2) < 15 angstrom and t(1) > 75 angstrom and it has been attributed to the resonance of the exchange-coupled NiFe layers across the Ru interlayers. For the other values of t(1) and t(2), several FMR modes appeared and they were associated to non-coupled magnetic phases with different effective magnetization formed during the multilayer growth. The FMR linewidths were analyzed as a function of the magnetic layer thickness and a strong dependence on t(1)(-2) was observed It was attributed to the contribution of the two-magnon scattering mechanism for the linewidth. (C) 2013 Elsevier B.V. All rights reserved

【 授权许可】

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