Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination

In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a metal film strongly affects...

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Bibliographic Details
Published in:Materials 2022-04, Vol.15 (8), p.2814
Main Authors: Krysztofik, Adam, Kuznetsov, Nikolai, Qin, Huajun, Flajšman, Lukáš, Coy, Emerson, van Dijken, Sebastiaan
Format: Article
Language:English
Subjects:
Crystal defects
Ferromagnetic materials
Ferromagnetic resonance
Gadolinium
Gadolinium-gallium garnet
Iridium
Lasers
Magnetic damping
Magnetic fields
Magnetic properties
Magnons
Propagation
Reflectance
Scanning electron microscopy
Signal reflection
Simulation
Spectrum analysis
Substrates
Wave packets
Wave propagation
Wave reflection
Waveguides
Yttrium-iron garnet
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Summary:In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a metal film strongly affects the crystalline structure of YIG and its magnetic damping. Despite the presence of structural defects, however, the YIG films exhibit a clear ferromagnetic resonance response. The ability to tune the magnetic damping without substantial changes to magnetization offers attractive prospects for the design of complex spin-wave conduits. We show that the insertion of a 1-nm-thick metal layer between YIG and GGG already increases the effective damping parameter enough to efficiently absorb spin waves. This bilayer structure can therefore be utilized for magnonic waveguide termination. Investigating the dispersionless propagation of spin-wave packets, we demonstrate that a damping unit consisting of the YIG/metal bilayers can dissipate incident spin-wave signals with reflection coefficient R < 0.1 at a distance comparable to the spatial width of the wave packet.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15082814