Wave-vector-dependent spin pumping as a probe of exchange-coupled magnons

Fukami, Masaya; Tateno, Yuma; Sekiguchi, Koji; Ando, Kotoji

doi:10.1103/physrevb.93.184429

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…[11][12][13][14] Specifically, the precessing magnetization of spin waves can emit angular momentum into an adjacent normal-metal (NM) in the form of a pure-spin-current, which can then be converted to an electrically detectable charge current via the ISHE. The SP-ISHE detection method is considered to have no limitation from the spin-wave wavelength, [15,16] and therefore has the advantage of detecting spin waves in the dipole-exchange region, where the strength of the dipole-dipole interaction and the exchange interaction are comparable. Many experimental studies on this subject have been reported, such as SP driven by parametrically excited exchange magnons, [17][18][19] bistable exchange spin waves, [20] and magnon polarons.…”

Section: Introductionmentioning

confidence: 99%

Spin pumping by higher-order dipole-exchange spin-wave modes

Wang

2023

Chinese Phys. B

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Spin pumping (SP) and inverse spin Hall effect (ISHE) driven by parametrically-excited dipole-exchange spin waves in a yttrium iron garnet film have been systematically investigated. The measured voltage spectrum exhibits a feature of the field-induced transition from parallel pumping to perpendicular pumping because of the inhomogeneous excitation geometry. Thanks to the high precision of the SP-ISHE detection, two sets of fine structures in the voltage spectrum are observed, which can correspond well to two kinds of critical points in the multimode spin-wave spectrum for magnetic films. One is the q = 0 point of each higher-order dispersion branch, and the other is the local minimum due to the interplay between the dipolar and exchange interactions. These fine structures on the voltage spectrum confirm the spin pumping by higher-order dipole-exchange spin-wave modes, and are helpful for probing the multimode spin-wave spectrum.

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Section: Introductionmentioning

confidence: 99%

Spin pumping by higher-order dipole-exchange spin-wave modes

Wang

2023

Chinese Phys. B

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“…A widely used spin pumping method is now implemented to study SW dynamics in micro-or nanoheterostructures. [18][19][20][21] Spin pumping (SP) is a transform of the spin angular momentum of magnons into a spin current at the ferromagneticnonmagnetic metal interface. 22 The electrical detection of SW results from the spin to charge current conversion in heavy metal like Pt due to the inverse spin Hall effect (ISHE).…”

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confidence: 99%

Magnons parametric pumping in bulk acoustic waves resonator

Alekseev

Dizhur

Polzikova

et al. 2020

Applied Physics Letters

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We report on the experimental observation of excitation and detection of parametric spin waves and spin currents in the bulk acoustic wave resonator. The hybrid resonator consists of ZnO piezoelectric film, yttrium iron garnet (YIG) films on gallium gadolinium garnet substrate, and a heavy metal Pt layer. Shear bulk acoustic waves are electrically excited in the ZnO layer due to piezoeffect at the resonant frequencies of the resonator. The magnetoelastic interaction in the YIG film emerges magnons (spin waves) excitation by acoustic waves either on resonator's eigenfrequencies or the half-value frequencies at supercritical power. We investigate acoustic pumping of magnons at the half-value frequencies and acoustic spin pumping from parametric magnons, using the inverse spin Hall effect in the Pt layer. The constant electric voltage in the Pt layer, depending on the frequency, the magnetic field, and the pump power, was systematically studied. We explain the low threshold obtained (∼ 0.4 mW) by the high efficiency of electric power transmission into the acoustic wave in the resonator.The studies in the field of magnonics or magnon spintronics direct to employ microwave spin waves (SW) as main carriers of information data transmission and processing. [1][2][3][4] Therefore, the problem of interaction between SW (or their quanta -magnons) and other condensed matter excitations (phonons, electrons, etc.) is of great importance. The numerous manifestations of SW -acoustic wave (AW) interaction in microand nanoscale structures, especially the conversion of magnetic energy into elastic and vice versa, are of interest both for practical applications and fundamental physics. [5][6][7][8] The elastic excitation of SW can be carried out without the alternating magnetic fields, which substantially reduce ohmic losses in comparison with the inductive current-driven excitation. 9 So the magnon-phonon interaction is very promising for the development of low energy SW logic circuits and memory elements.Linear excitation of acoustically driven spin waves (ADSW) was demonstrated in various hybrid magnon-phonon structures containing piezoelectric (PE) and ferromagnetic layers. [10][11][12][13] To excite ADSW, the close contact between the layers is unnecessary, and a high-Q acoustic medium can separate the layers with neither PE nor ferromagnetic properties. [14][15][16] Strain-induced magnon effects, such as SW generation, propagation, and amplification in magnetoelectric structures with close contacts of PE and thin ferromagnetic films also gained a lot of attention recently. 1,9,17 Ferromagnetic (at microwave frequencies) yttrium iron garnet (Y 3 Fe 5 O 12 -YIG) grown onto gadolinium gallium garnet (GGG) substrate has extremely low losses of spin waves and acoustic waves, and their high conversion efficiency. It makes YIG-GGG the perfect candidate for magnon spintronics devices. Thus, investigations of acoustically driven spin waves a

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Magnon transport controlled by local parametric excitation

Tateno

Ando

2016

Applied Physics Letters

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We report that magnetostatic magnon transport can be controlled by local parametric excitation of short-wavelength magnons. We found that the parametrically excited magnon either enhances or suppresses the traveling magnetostatic magnons, depending on the frequency of the magnetostatic magnons. Our time-domain measurements of the magnon transport show that the change in the static magnetization due to the creation of the parametrically excited magnons is responsible for the control of the magnetostatic magnon transport. This result provides insight into magnon-based devices without complex microprocessing.

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Wave-vector-dependent spin pumping as a probe of exchange-coupled magnons

Cited by 6 publications

References 29 publications

Spin pumping by higher-order dipole-exchange spin-wave modes

Spin pumping by higher-order dipole-exchange spin-wave modes

Magnons parametric pumping in bulk acoustic waves resonator

Magnon transport controlled by local parametric excitation

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