Nonlinear ferromagnetic resonance in permalloy films: A nonmonotonic power-dependent frequency shift

Khivintsev, Yu. V.; Kuanr, Bijoy K.; Fal, T. J.; Haftel, Michael I.; Camley, R. E.; Celiński, Z.; Mills, D. L.

doi:10.1103/physrevb.81.054436

Cited by 40 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although we discussed that a higher f m results in an increase of N-FMR frequency and an increase of microwave absorption around the f m , a deviation from such behavior can occur because the N-FMR frequency can be a function of the precession amplitude. It is known that for a high power microwave, the FMR frequency is shifted to a higher or a lower frequency as a function of incident microwave power, where the sign of the shift depends on the magnetic property of the material, applied static magnetic field, excitation microwave frequency, and so on 32 33 34 . This nonlinear FMR frequency shift may be responsible for the deviation of the N-FMR frequency change.…”

Section: Resultsmentioning

confidence: 99%

Adaptive microwave impedance memory effect in a ferromagnetic insulator

Lee

Friedman

2016

Nat Commun

View full text Add to dashboard Cite

Adaptive electronics, which are often referred to as memristive systems as they often rely on a memristor (memory resistor), are an emerging technology inspired by adaptive biological systems. Dissipative systems may provide a proper platform to implement an adaptive system due to its inherent adaptive property that parameters describing the system are optimized to maximize the entropy production for a given environment. Here, we report that a non-volatile and reversible adaptive microwave impedance memory device can be realized through the adaptive property of the dissipative structure of the driven ferromagnetic system. Like the memristive device, the microwave impedance of the device is modulated as a function of excitation microwave passing through the device. This kind of new device may not only helpful to implement adaptive information processing technologies, but also may be useful to investigate and understand the underlying mechanism of spontaneous formation of complex and ordered structures.

show abstract

Section: Resultsmentioning

confidence: 99%

Adaptive microwave impedance memory effect in a ferromagnetic insulator

Lee

Friedman

2016

Nat Commun

View full text Add to dashboard Cite

show abstract

“…This kinematically allowed scattering limits the achievable amplitude of spin wave modes and leads to broadening of the spin wave resonance. These processes lead to a resonance broadening [40,[46][47][48] and cannot explain the observed split-peak lineshape of the resonance. In nanoscale ferro-magnets, geometric confinement discretizes the spin wave spectrum and thereby generally eliminates the kinematically allowed multi-magnon scattering.…”

Section: Theoretical Modelmentioning

confidence: 93%

Giant nonlinear damping in nanoscale ferromagnets

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The shoulder at lower magnetic field is widened in comparison to the shoulder at higher fields. The reason for this asymmetry might be due to the formation of a foldover effect [49,50], due to nonlinear damping or a nonlinear frequency shift [51,52]. The results of the damping parameter α eff obtained by microwave power dependent spin-pumping measurements are depicted in Fig.…”

Section: Influence Of Nonlinear Effects On the Spin-pumping Procesmentioning

confidence: 98%

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

et al. 2015

View full text Add to dashboard Cite

The dependence of the spin-pumping effect on the yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) thickness detected by the inverse spin Hall effect (ISHE) has been investigated quantitatively. Due to the spin-pumping effect driven by the magnetization precession in the ferrimagnetic insulator Y 3 Fe 5 O 12 film a spin-polarized electron current is injected into the Pt layer. This spin current is transformed into electrical charge current by means of the ISHE. An increase of the ISHE voltage with increasing film thickness is observed and compared to the theoretically expected behavior. The effective damping parameter of the YIG/Pt samples is found to be enhanced with decreasing Y 3 Fe 5 O 12 film thickness. The investigated samples exhibit a spin mixing conductance of g ↑↓ eff = (3.87 ± 0.21) × 10 18 m −2 and a spin Hall angle between θ ISHE = 0.013 ± 0.001 and 0.045 ± 0.004 depending on the used spin-diffusion length. Furthermore, the influence of nonlinear effects on the generated voltage and on the Gilbert damping parameter at high excitation powers is revealed. It is shown that for small YIG film thicknesses a broadening of the linewidth due to nonlinear effects at high excitation powers is suppressed because of a lack of nonlinear multimagnon scattering channels. We have found that the variation of the spin-pumping efficiency for thick YIG samples exhibiting pronounced nonlinear effects is much smaller than the nonlinear enhancement of the damping.

show abstract

Nonlinear ferromagnetic resonance in permalloy films: A nonmonotonic power-dependent frequency shift

Cited by 40 publications

References 16 publications

Adaptive microwave impedance memory effect in a ferromagnetic insulator

Adaptive microwave impedance memory effect in a ferromagnetic insulator

Giant nonlinear damping in nanoscale ferromagnets

Thickness and power dependence of the spin-pumping effect inY3Fe5O12/Pt heterostructures measured by the inverse spin Hall effect

Contact Info

Product

Resources

About