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Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

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ABSTRACT

Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

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Spatial localization of the auto-oscillations across the gap between the electrodes.(a) Spatial profiles of the oscillation intensity recorded for different dc currents, as labeled. (b) Current dependence of the full width at half maximum (FWHM) of the spatial profiles. The data were recorded at H0 = 1000 Oe. Symbols are experimental data, curves are guides for the eye.
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f4: Spatial localization of the auto-oscillations across the gap between the electrodes.(a) Spatial profiles of the oscillation intensity recorded for different dc currents, as labeled. (b) Current dependence of the full width at half maximum (FWHM) of the spatial profiles. The data were recorded at H0 = 1000 Oe. Symbols are experimental data, curves are guides for the eye.

Mentions: According to the described scenario, the current-induced auto-oscillations are also expected to demonstrate a spatial broadening in the y-direction. The corresponding experimental data are shown in Fig. 4. We note that the y-profiles of the auto-oscillations (Fig. 4a) are mostly determined by the confining potential, which prevents the extension of the dynamic excitations outside the region of the gap between the electrodes. Because of the limited spatial resolution of the used technique, which can be estimated as 240–250 nm, one cannot quantitatively analyze the broadening of the y-profiles with the increase in the dc current. However, from Fig. 4b it is seen, that the y-width also tends to increase with increasing I.


Direct observation of dynamic modes excited in a magnetic insulator by pure spin current
Spatial localization of the auto-oscillations across the gap between the electrodes.(a) Spatial profiles of the oscillation intensity recorded for different dc currents, as labeled. (b) Current dependence of the full width at half maximum (FWHM) of the spatial profiles. The data were recorded at H0 = 1000 Oe. Symbols are experimental data, curves are guides for the eye.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5016739&req=5

f4: Spatial localization of the auto-oscillations across the gap between the electrodes.(a) Spatial profiles of the oscillation intensity recorded for different dc currents, as labeled. (b) Current dependence of the full width at half maximum (FWHM) of the spatial profiles. The data were recorded at H0 = 1000 Oe. Symbols are experimental data, curves are guides for the eye.
Mentions: According to the described scenario, the current-induced auto-oscillations are also expected to demonstrate a spatial broadening in the y-direction. The corresponding experimental data are shown in Fig. 4. We note that the y-profiles of the auto-oscillations (Fig. 4a) are mostly determined by the confining potential, which prevents the extension of the dynamic excitations outside the region of the gap between the electrodes. Because of the limited spatial resolution of the used technique, which can be estimated as 240–250 nm, one cannot quantitatively analyze the broadening of the y-profiles with the increase in the dc current. However, from Fig. 4b it is seen, that the y-width also tends to increase with increasing I.

View Article: PubMed Central - PubMed

ABSTRACT

Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

No MeSH data available.


Related in: MedlinePlus