Influencing Spin Waves with Dipole Fields of Co/Pt Nanomagnets
Within the scope of the current research project “Spin-wave platform in hybrid PMA/YIG films”, we are developing and experimentally demonstrating a hybrid ferri-/ferromagnetic platform for spin-wave-based computing and signal processing. YIG (yttrium-iron garnet) is chosen to be the medium for spin-wave propagation for its extremely low magnetic damping. Ferromagnets with PMA (perpendicular magnetic anisotropy) would provide effective and reconfigurable means to influence the propagation of spin waves; essential to create practical devices. PMA ferromagnets, fabricated on top of the YIG film, create magnetic fields patterns, which change the local dispersion properties of the underlying YIG film. The magnets may also be coupled to each other via dipole fields, building up a reconfigurable pNML (perpendicular nanomagnetic logic) circuit. This technique can be used to realize reconfiguration with a low number of magneto-electrical transducers. In summary, the goal of this project is the design and the experimental demonstration of a hybrid spin-wave based platform for future integrated computing and signal-processing devices.
b) The dipole fields of the nanomagnets change the spin wave dispersion relation in YIG locally, thus the array creates a periodic alternation of the magnonic refractive index.
c) Hence, the configuration of the dipole field pro-file results in the formation of magnonic bandgaps analogously to a photonic crystal.
Funding and Duration
This project is funded by the research grant “Spin-wave platform in hybrid PMA/YIG films” of German Science Foundation DFG
Duration: since 2019
Additional Funding kindly acknowledged from BaCaTec
http://www.bacatec.de/de/gefoerderte_projekte.html
Further Information
Principal Investigator: Markus Becherer
Doctoral Candidates: Martina Kiechle
Homepage + Links
https://gepris.dfg.de/gepris/projekt/429656450