Uncovering magnetic properties of NiFe/WTi multilayers by FMR and SWR analyses

•Damping constant dependence on the NiFe and WTi layer thicknesses.•Magnetic coupling dependence on the NiFe and WTi layer thicknesses.•Evidences of interface and optical resonance modes.•Emergence of volume and surface spin wave resonance modes.•Spin-pumping and the mixing of electrical conductance...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-03, Vol.498, p.166183, Article 166183
Main Authors: Figueiredo, L.C., Pelegrini, F., Biondo, A., Pessoa, M.S., Nascimento, V.P., Baggio-Saitovitch, E.
Format: Article
Language:English
Subjects:
Damping
Damping constant
Effective magnetic coupling
Ferromagnetic resonance
Ferromagnetism
Intermetallic compounds
Iron compounds
Magnetic properties
Magnons
Multilayers
Nickel compounds
NiFe/WTi multilayers
Optical pumping
Resistance
Spin-wave resonance
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Summary:•Damping constant dependence on the NiFe and WTi layer thicknesses.•Magnetic coupling dependence on the NiFe and WTi layer thicknesses.•Evidences of interface and optical resonance modes.•Emergence of volume and surface spin wave resonance modes.•Spin-pumping and the mixing of electrical conductance at the interfaces. Ferromagnetic resonance (FMR) was applied to uncover the magnetic properties of NiFe/WTi multilayers, which showed themselves up as ideal candidates to exemplify the several resonance modes [optic, uniform, and interface FMR modes, volume and surface spin wave resonance (SWR) modes] that can emerge from the probing materials during the measurements: an instructive work to describe what can be revealed by this powerful technique. The absorption modes excited by the microwave field were correlated to important magnetic parameters and characteristic of each multilayer studied by using the FMR and SWR theories and the associated fittings. In particular, the dependence of the damping constant on the thicknesses of magnetic and spacer layers, attributed to both the effects of spin-pumping and mixing of electrical conductance at the magnetic/non-magnetic interfaces, opens the possibility of tailoring the NiFe/WTi structures for specific device applications.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.166183