Py-Cu Graded-Index Magnonic Waveguides
ORAL
Abstract
Spin waves (magnons) have many optical analogies, including the law of reflection, which allows total internal reflection (akin to a fiber optic cable). For this reason, we’re working to create a magnonic waveguide made from Py-Cu multilayered films.
We grow films via sputter deposition with a 10 nm core of Py0.8Cu0.2 that is symmetrically bound by 10 nm of Cu and 10 nm of Py0.6Cu0.4. Py-Cu alloys are attractive for this study because we can easily tune magnetic properties by changing the Cu content of each layer (TC decreases as Cu content increases).
We measure samples using ferromagnetic resonance (FMR) with frequencies from 3-20 GHz and fit results to the Kittel equation. We extract values for the Gilbert damping parameter and inhomogeneous broadening, which informs us of how magnons propagate through each multilayer film.
Ideally, if we reverse the magnetic layers, instead of seeing total internal reflection, we should observe a complete spin absorber.
We grow films via sputter deposition with a 10 nm core of Py0.8Cu0.2 that is symmetrically bound by 10 nm of Cu and 10 nm of Py0.6Cu0.4. Py-Cu alloys are attractive for this study because we can easily tune magnetic properties by changing the Cu content of each layer (TC decreases as Cu content increases).
We measure samples using ferromagnetic resonance (FMR) with frequencies from 3-20 GHz and fit results to the Kittel equation. We extract values for the Gilbert damping parameter and inhomogeneous broadening, which informs us of how magnons propagate through each multilayer film.
Ideally, if we reverse the magnetic layers, instead of seeing total internal reflection, we should observe a complete spin absorber.
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Presenters
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Kristen Repa
Rochester Institute of Technology
Authors
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Kristen Repa
Rochester Institute of Technology
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Celia Mercovich
Rochester Institute of Technology
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Casey Miller
Rochester Institute of Technology