Controlled nonlinear magnetic damping in spin-Hall nano-devices

Divinskiy, B.; Urazhdin, Sergei; Demokritov, S. O.; Demidov, V. E.

doi:10.1038/s41467-019-13246-7

Cited by 54 publications

(43 citation statements)

References 30 publications

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“…In the last decade, nonlinear dissipation has attracted much attention with applications that span nanomechanics 1 , materials science 2 , biomechanics 3 , thermodynamics 4 , spintronics, 5 and quantum information 6 . It has been shown that the nonlinear dissipation process follows the empirical force model where τ nl1 is the nonlinear damping coefficient, x is the displacement, and velocity.…”

Section: Introductionmentioning

confidence: 99%

Tuning nonlinear damping in graphene nanoresonators by parametric–direct internal resonance

et al. 2021

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Mechanical sources of nonlinear damping play a central role in modern physics, from solid-state physics to thermodynamics. The microscopic theory of mechanical dissipation suggests that nonlinear damping of a resonant mode can be strongly enhanced when it is coupled to a vibration mode that is close to twice its resonance frequency. To date, no experimental evidence of this enhancement has been realized. In this letter, we experimentally show that nanoresonators driven into parametric-direct internal resonance provide supporting evidence for the microscopic theory of nonlinear dissipation. By regulating the drive level, we tune the parametric resonance of a graphene nanodrum over a range of 40–70 MHz to reach successive two-to-one internal resonances, leading to a nearly two-fold increase of the nonlinear damping. Our study opens up a route towards utilizing modal interactions and parametric resonance to realize resonators with engineered nonlinear dissipation over wide frequency range.

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Section: Introductionmentioning

confidence: 99%

Tuning nonlinear damping in graphene nanoresonators by parametric–direct internal resonance

et al. 2021

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“…It exhibits significant strain-induced perpendicular magnetic anisotropy (PMA) with the effective anisotropy field µ 0 H a = 167 mT, which is very close to the saturation magnetization of the film µ 0 M s = 175 mT. This leads to the compensation of the effects associated with the dipolar anisotropy and thus results in the minimization of nonlinear magnon interactions 39 . The spin system of the BiYIG film is driven out of the equilibrium by spin torque through the injection of the pure spin current I s created by the SHE in the Pt electrode carrying dc electric current I .…”

Section: Resultsmentioning

confidence: 94%

“…In contrast, in nanometer-thick YIG films, which can be efficiently driven by spin currents, the energy of the lowest magnon level contains a significant dynamic dipolar contribution, which results in a strong attractive interaction between magnons leading to spatial instabilities and collapses 27 , 38 . The nonlinearities associated with dipolar effects have also been recently shown to be responsible for the strong scattering of magnons out from the lowest-energy state preventing its overpopulation 39 .…”

Section: Introductionmentioning

confidence: 99%

Evidence for spin current driven Bose-Einstein condensation of magnons

Divinskiy¹,

Merbouche

Demidov³

et al. 2021

Nat Commun

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The quanta of magnetic excitations – magnons – are known for their unique ability to undergo Bose-Einstein condensation at room temperature. This fascinating phenomenon reveals itself as a spontaneous formation of a coherent state under the influence of incoherent stimuli. Spin currents have been predicted to offer electronic control of Bose-Einstein condensates, but this phenomenon has not been experimentally evidenced up to now. Here we show that current-driven Bose-Einstein condensation can be achieved in nanometer-thick films of magnetic insulators with tailored nonlinearities and minimized magnon interactions. We demonstrate that, above a certain threshold, magnons injected by the spin current overpopulate the lowest-energy level forming a highly coherent spatially extended state. We quantify the chemical potential of the driven magnon gas and show that, at the critical current, it reaches the energy of the lowest magnon level. Our results pave the way for implementation of integrated microscopic quantum magnonic and spintronic devices.

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“…In this work, Object-Oriented Micromagnetic Framework (OOMMF) simulations were performed on the filter structure shown in Figure 1a. OOMMF solves Landau-Lifshitz-Gilbert (LLG) equation using finite-difference methods [20][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

2021

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Magnonic crystals and gratings could enable tunable spin-wave filters, logic, and frequency multiplier devices. Using micromagnetic models, we investigate the effect of nanowire damping, excitation frequency and geometry on the spin wave modes, spatial and temporal transmission profiles for a finite patterned nanograting under external direct current (DC) and radio frequency (RF) magnetic fields. Studying the effect of Gilbert damping constant on the temporal and spectral responses shows that low-damping leads to longer mode propagation lengths due to low-loss and high-frequency excitations are also transmitted with high intensity. When the nanowire is excited with stronger external RF fields, higher frequency spin wave modes are transmitted with higher intensities. Changing the nanowire grating width, pitch and its number of periods helps shift the transmitted frequencies over super high-frequency (SHF) range, spans S, C, X, Ku, and K bands (3–30 GHz). Our design could enable spin-wave frequency multipliers, selective filtering, excitation, and suppression in magnetic nanowires.

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Controlled nonlinear magnetic damping in spin-Hall nano-devices

Cited by 54 publications

References 30 publications

Tuning nonlinear damping in graphene nanoresonators by parametric–direct internal resonance

Tuning nonlinear damping in graphene nanoresonators by parametric–direct internal resonance

Evidence for spin current driven Bose-Einstein condensation of magnons

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

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