2022
DOI: 10.1063/5.0082724
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Fast long-wavelength exchange spin waves in partially compensated Ga:YIG

Abstract: Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed in small-scale devices, the group velocity is directly proportional to the spin-wave exchange stiffness constant [Formula: see text]. Using wave vector resolved Brillouin light scattering spectroscopy, we directly measure [Formula: see text] in Ga-substituted YIG thin films and show that it is about three times larger than for… Show more

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Cited by 22 publications
(16 citation statements)
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“…Making the Talbot length dependent on the parameter M = d /λ and the wavenumber k , we can also derive the formula for the time‐delay ( t d = z T / v gr ) of devices based on self‐imaging in the exchange interactions regime, where ωlex2ωMk2$\omega \approx l_{ex}^2{\omega _{\rm{M}}}{k^2}$, getting tdbadbreak=zTfalse(Mfalse)vgrgoodbreak=πM2γλex1k2\[{t_{\rm{d}}} = \frac{{{z_{\rm{T}}}(M)}}{{{v_{gr}}}} = \frac{{\pi {M^2}}}{{\gamma {\lambda _{ex}}}}\frac{1}{{{k^2}}}\] To validate these predictions, we calculate the relationship between the Talbot length values and the group velocity characteristic for a given material ( t d = z T / v gr ) as a function of the wave vector. We perform this analysis assuming M = 3 and comparing results for films of thickness L = 5 nm made of three different materials, that is, YIG, permalloy (Py) and Ga‐substituted YIG (Ga:YIG), [ 41 ] see Figure 8a.…”
Section: Discussionmentioning
confidence: 99%
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“…Making the Talbot length dependent on the parameter M = d /λ and the wavenumber k , we can also derive the formula for the time‐delay ( t d = z T / v gr ) of devices based on self‐imaging in the exchange interactions regime, where ωlex2ωMk2$\omega \approx l_{ex}^2{\omega _{\rm{M}}}{k^2}$, getting tdbadbreak=zTfalse(Mfalse)vgrgoodbreak=πM2γλex1k2\[{t_{\rm{d}}} = \frac{{{z_{\rm{T}}}(M)}}{{{v_{gr}}}} = \frac{{\pi {M^2}}}{{\gamma {\lambda _{ex}}}}\frac{1}{{{k^2}}}\] To validate these predictions, we calculate the relationship between the Talbot length values and the group velocity characteristic for a given material ( t d = z T / v gr ) as a function of the wave vector. We perform this analysis assuming M = 3 and comparing results for films of thickness L = 5 nm made of three different materials, that is, YIG, permalloy (Py) and Ga‐substituted YIG (Ga:YIG), [ 41 ] see Figure 8a.…”
Section: Discussionmentioning
confidence: 99%
“…). [41] The solid lines represent the results obtained assuming dispersion relation described by Equation ( 2)) whereas the dashed lines represent the exchange approximation (Equation ( 5)). b) t d (k) dependencies for different M values.…”
Section: Discussionmentioning
confidence: 99%
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“…In addition, there is an increasing attention in magnetoelasticity since it can be exploited in spin waves generation [3][4][5][6]. Spin waves are collective excitations of the electron spin system, and they have been proposed for applications such as information transfer with low energy dissipation, high-speed technology or analog computing [3,[7][8][9][10]. In that sense, spin textures play a fundamental role for the stabilization and manipulation of spin waves, and therefore, a huge effort is performing for the development of tunable magnetic structures.…”
Section: Introductionmentioning
confidence: 99%