Spin pumping contribution to the magnetization damping in Tm3Fe5O12/W bilayers

•Realistic measurement of the spin pumping FMR linewidth.•Filtered Spin mix conductance.•Magnetic damping enhancement due to non-magnetic layer deposition onto Tm3Fe5O12.•Gilbert, mosaicity and two-magnon scattering mechanism in Tm3Fe5O12. In this work, thulium iron garnet (Tm3Fe5O12 – TmIG (20 nm)/...

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Published in:Journal of magnetism and magnetic materials 2022-02, Vol.543, p.168630, Article 168630
Main Authors: Oliveira, A.B., Rodríguez-Suárez, R.L., Vilela-Leão, L.H., Vilela, G.L.S., Gamino, M., Silva, E.F., Bohn, F., Correa, M.A., Moodera, J.S., Chesman, C.
Format: Article
Language:English
Subjects:
Damping
Ferromagnetic line broadening
Ferromagnetic materials
Ferromagnetic resonance
Gadolinium
Gadolinium-gallium garnet
Gilbert-like damping
Line broadening
Magnetic anisotropy
Magnetization
Magnons
Mosaicity
Pumping
Spin mix conductance
Spin pumping
Spintronics
Substrates
Thulium
Tungsten
Two magnon scattering
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Summary:•Realistic measurement of the spin pumping FMR linewidth.•Filtered Spin mix conductance.•Magnetic damping enhancement due to non-magnetic layer deposition onto Tm3Fe5O12.•Gilbert, mosaicity and two-magnon scattering mechanism in Tm3Fe5O12. In this work, thulium iron garnet (Tm3Fe5O12 – TmIG (20 nm)/Tungsten(W)(t) bilayers, sputtered on top of gadolinium gallium garnet (111) substrate, were used to investigate spin pumping (SP) line broadening mechanism in Ferromagnetic Resonance (FMR). The TmIG, films prior and after tungsten cap layer deposition, were investigated employing FMR and X-ray diffraction techniques. The TmIG films showed (111) orientation and perpendicular magnetic anisotropy (PMA). Due to the interface TmIG/W, when the TmIG magnetization is in resonance a spin current is pumped out the TmIG into the W layer, increasing the damping of the magnetization. Measuring the out-of-plane angular dependence of the FMR resonance field and linewidth, we were able to obtain solely the SP contribution to the line broadening, filtering Gilbert, mosaicity, and two magnon scattering mechanisms.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168630