Spin Pumping by Parametrically Excited Exchange Magnons

Sandweg, C. W.; Kajiwara, Y.; Chumak, A. V.; Serga, Alexander A.; Vasyuchka, Vitaliy I.; Jungfleisch, M. Benjamin; Saitoh, Eiji; Hillebrands, B.

doi:10.1103/physrevlett.106.216601

Cited by 302 publications

(256 citation statements)

References 18 publications

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“…As such, it is the theoretical maximum. The other parameter that will have the largest impact on the numerical solution to eqns (3) and (4) …”

Section: Appendix D: Effect Of Spin Sinking and The Upper Bound Of Mamentioning

confidence: 99%

“…In magnetically ordered insulators, spin currents are carried by magnons. These spin currents are typically generated via the spin Hall effect [2] or through spin pumping, in which a microwave magnetic field excites spin-waves of approximately 10 GHz [3] . Such microwave frequency spin-waves have been proposed for use in logic devices with low power consumption [4], and recently an all-magnon based transistor was demonstrated [5].…”

Section: Introductionmentioning

confidence: 99%

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Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

et al. 2015

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The spin diffusion length for thermally excited magnon spins is measured by utilizing a non-local spin-Seebeck effect measurement. In a bulk single crystal of yttrium iron garnet (YIG) a focused laser thermally excites magnon spins. The spins diffuse laterally and are sampled using a Pt inverse spin Hall effect detector. Thermal transport modeling and temperature dependent measurements demonstrate the absence of spurious temperature gradients beneath the Pt detector and confirm the non-local nature of the experimental geometry. Remarkably, we find that thermally excited magnon spins in YIG travel over 120 µm at 23 K, indicating that they are robust against inelastic scattering. The spin diffusion length is found to be at least 47 µm and as high as 73 µm at 23 K in YIG, while at room temperature it drops to less than 10 µm. Based on this long spin diffusion length, we envision the development of thermally powered spintronic devices based on electrically insulating, but spin conducting materials.2

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“…As such, it is the theoretical maximum. The other parameter that will have the largest impact on the numerical solution to eqns (3) and (4) …”

Section: Appendix D: Effect Of Spin Sinking and The Upper Bound Of Mamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

et al. 2015

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“…"Backward" waves have a frequency dispersion with a negative group velocity for some wavelengths. While these spin waves have been studied in great detail over the last decades, the effect of an adjacent normal metal on these waves has only recently been investigated.Experimentally, it has been observed that spinpumping differs for FVMSWs, BVMSWs and MSSWs and that it depends on the spin-wave wavelength [6,8,9,[12][13][14]. Recent experiments [8] have demonstrated that the magnetization dissipation is larger for surface spin waves in which the excitation amplitude is localized at the magnetic insulator-normal metal interface.…”

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confidence: 99%

“…Experimentally, it has been observed that spinpumping differs for FVMSWs, BVMSWs and MSSWs and that it depends on the spin-wave wavelength [6,8,9,[12][13][14]. Recent experiments [8] have demonstrated that the magnetization dissipation is larger for surface spin waves in which the excitation amplitude is localized at the magnetic insulator-normal metal interface.…”

mentioning

confidence: 99%

“…Careful experimental investigations of spin-pumping and the associated enhanced magnetization dissipation were recently performed, demonstrating that the dynamic coupling between the magnetization dynamics in magnetic insulators and spin currents in adjacent normal metals is strong. Importantly, in magnetic insulators, an exceptionally low intrinsic damping combined with good material control has enabled the study of spin-pumping for a much larger range of wave vectors than has previously been obtained in metallic ferromagnets [5][6][7][8][9][10][11][12][13][14].…”

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confidence: 99%

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Spin Pumping and Enhanced Gilbert Damping in Thin Magnetic Insulator Films

Kapelrud

Brataas

2013

Phys. Rev. Lett.

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Precessing magnetization in a thin film magnetic insulator pumps spins into adjacent metals; however, this phenomenon is not quantitatively understood. We present a theory for the dependence of spin-pumping on the transverse mode number and in-plane wave vector. For long-wavelength spin waves, the enhanced Gilbert damping for the transverse mode volume waves is twice that of the macrospin mode, and for surface modes, the enhancement can be ten or more times stronger. Spinpumping is negligible for short-wavelength exchange spin waves. We corroborate our analytical theory with numerical calculations in agreement with recent experimental results. PACS numbers: 76.50.+g, 75.30.Ds, 75.76.+j, Metallic spintronics have been tremendously successful in creating devices that both fulfill significant market needs and challenge our understanding of spin transport in materials. Topics that are currently of great interest are spin transfer and spin-pumping [1][2][3], spin Hall effects [4], and combinations thereof for use in non-volatile memory, oscillator circuits, and spin wave logic devices. A recent experimental demonstration that spin transfer and spin-pumping can be as effective in magnetic insulators as in metallic ferromagnetic systems was surprising and has initiated a new field of inquiry [5].In magnetic insulators, no moving charges are present, and in some cases, the dissipative losses associated with the magnetization dynamics are exceptionally low. Nevertheless, when a magnetic insulator is placed in contact with a normal metal, magnetization dynamics induce spin-pumping, which in turn causes angular momentum to be dumped to the metal's itinerant electron system. Due to this non-local interaction, the magnetization losses become enhanced. Careful experimental investigations of spin-pumping and the associated enhanced magnetization dissipation were recently performed, demonstrating that the dynamic coupling between the magnetization dynamics in magnetic insulators and spin currents in adjacent normal metals is strong. Importantly, in magnetic insulators, an exceptionally low intrinsic damping combined with good material control has enabled the study of spin-pumping for a much larger range of wave vectors than has previously been obtained in metallic ferromagnets [5][6][7][8][9][10][11][12][13][14].In thin film ferromagnets, the magnetization dynamics are strongly affected by the long-range dipolar interaction, which has both static and spatiotemporal contributions. This yields different types of spin waves. When the in-plane wavelength is comparable to the film thickness or greater, the long-range dipolar interaction causes the separation of the spin-wave modes into three classes depending on the relative orientation of the applied external field, in relation to the film normal, and the spinwave propagation direction [15][16][17][18][19][20]. These spin waves are classified according to their dispersion and transverse magnetization distribution as forward volume magnetostatic spin waves (FVMSWs) when the external...

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