Spin Pumping Driven by Magnon Polarons

Hayashi, Hiroki; Ando, Kotoji

doi:10.1103/physrevlett.121.237202

Cited by 62 publications

(42 citation statements)

References 51 publications

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“…Injection of coherent phonons at high frequencies in the THz range has been achieved using ultrafast lasers [63]. In a direct analogy with spin pumping driven via coherent elastic waves [40], and subsequently formed magnon-polarons [28,64], in ferromagnets, these coherent THz phonons may directly excite the corresponding magnon-polarons, and result in a spin pumping current [28,64]. The latter may be detected electrically via inverse spin Hall effect (ISHE).…”

Section: Discussionmentioning

confidence: 99%

Magnon-polarons in cubic collinear antiferromagnets

et al. 2019

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We present a theoretical study of excitations formed by hybridization between magnons and phonons -magnonpolarons -in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can and cannot hybridize in a system thereby addressing the qualitative questions concerning magnonpolaron formation. As a specific and experimentally relevant case, we study Nickel Oxide quantitatively and find perfect agreement with the qualitative analysis, thereby highlighting the strength of the former. We find that there are two distinct features of antiferromagnetic magnon-polarons which differ from the ferromagnetic ones. First, hybridization between magnons and the longitudinal phonon modes is expected in many cubic antiferromagnetic structures. Second, we find that the very existence of certain hybridizations can be controlled via an external magnetic field, an effect which comes in addition to the ability to move the magnon modes relative to the phonons modes.arXiv:1812.09239v1 [cond-mat.mes-hall]

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Section: Discussionmentioning

confidence: 99%

Magnon-polarons in cubic collinear antiferromagnets

et al. 2019

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“…Magnetoelastic coupling (MEC), the interaction between spin waves (magnons) and lattice waves (phonons), was first investigated more than half a century ago [1][2][3] and has renewed attention in spintronics . By the MEC, magnons and phonons, in the vicinity of the crossings of their dispersion relations, are hybridized into quasiparticles called magnon polarons that share mixed magnonic and phononic characters [6,8,[10][11][12][20][21][22][23][24][25][26][27][28][29][30]. Magnon polarons can convey spin information with velocities close to those of phonons, much faster than the magnon velocities in the dipolar magnon regime [7,8,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Magnon polarons can convey spin information with velocities close to those of phonons, much faster than the magnon velocities in the dipolar magnon regime [7,8,14,15]. Besides, thanks to the long-lived phononic constituent, magnon polarons may have longer lifetimes than pure magnons and can enhance the spin-current related phenomena, such as the spin Seebeck effect [10-12, 17, 21-23, 29] and spin pumping [20].…”

Section: Introductionmentioning

confidence: 99%

Magnon polarons in the spin Peltier effect

et al. 2020

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We report the observation of anomalous peak structures induced by hybridized magnon-phonon excitation (magnon polarons) in the magnetic field dependence of the spin Peltier effect (SPE) in a Lu2Bi1Fe4Ga1O12 (BiGa:LuIG) with Pt contact. The SPE peaks coincide with magnetic fields tuned to the threshold of magnon-polaron formation, consistent with the previous observation in the spin Seebeck effect. The enhancement of SPE is attributed to the lifetime increase in spin current caused by magnon-phonon hybridization in BiGa:LuIG.

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“…As is evident from Fig. 7(b), the wavelengths of the magnons excited in the three-magnon process are ∼ 1000 nm, which corresponds to the dipole-exchange interaction region [11], [12] (around the minimum) of the dispersion relation. The angle of propagation is determined by the need to satisfy energy conservation while simultaneously considering where the magnon density of states is largest in k-space.…”

Section: Magnon Pair At the Power Thresholdmentioning

confidence: 74%

Nonlinear Magnon Scattering Mechanism for Microwave Pumping in Magnetic Films

Venugopal

Etheridge

et al. 2020

IEEE Access

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Magnon scattering enables non-linear microwave devices, such as frequency selective limiters and signal to noise enhancers. It may also impact information transfer within spintronic devices. Here, a quantitative understanding of magnon processes in thin films is developed using micromagnetic simulations, in combination with newly developed analytic theory and experimental data. A technique for calculating the number of magnons at each frequency and wavevector as a function of external input such as power and frequency is identified. It is shown that, near the nonlinear threshold, the dominant parametrically excited magnon pairs are those with minimal group velocity and the correct energy. These results complement Brillouin Light Scattering experiments and indicate a path for wavevector-modulated magnon production based only on simulated results and/or analytic theory, a desirable goal for information transfer and communication.

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Spin Pumping Driven by Magnon Polarons

Cited by 62 publications

References 51 publications

Magnon-polarons in cubic collinear antiferromagnets

Magnon-polarons in cubic collinear antiferromagnets

Magnon polarons in the spin Peltier effect

Nonlinear Magnon Scattering Mechanism for Microwave Pumping in Magnetic Films

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