Enhancement of the spin pumping efficiency by spin wave mode selection

Sandweg, C. W.; Kajiwara, Y.; Ando, Kotoji; Saitoh, Eiji; Hillebrands, B.

doi:10.1063/1.3528207

Cited by 144 publications

(119 citation statements)

References 21 publications

Supporting

Mentioning

111

Contrasting

Unclassified

Order By: Relevance

“…"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.…”

mentioning

confidence: 99%

“…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. To utilize spin-pumping from thin film magnetic insulators into adjacent normal metals, a coherent theoretical picture of these experimental findings must be developed and understood, which is the aim of our work.…”

mentioning

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].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Spin Pumping and Enhanced Gilbert Damping in Thin Magnetic Insulator Films

Kapelrud

Brataas

2013

Phys. Rev. Lett.

View full text Add to dashboard Cite

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...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Spin Pumping and Enhanced Gilbert Damping in Thin Magnetic Insulator Films

Kapelrud

Brataas

2013

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…Recently C. W. Sandweg et al [14] carried out studies of spin pumping efficiency across the YIG/Pt interface using the inverse spin-Hall effect (ISHE). In these studies, the dc voltage was measured across the Pt layer for different rf excitation modes.…”

mentioning

confidence: 99%

Spin Pumping at the Magnetic Insulator (YIG)/Normal Metal (Au) Interfaces

et al. 2011

View full text Add to dashboard Cite

Large Damping Enhancement in Dirac‐Semimetal–Ferromagnetic‐Metal Layered Structures Caused by Topological Surface States

Ding

Liu

Zhang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

This article reports damping enhancement in a ferromagnetic NiFe thin film due to an adjacent α‐Sn thin film. Ferromagnetic resonance studies show that an α‐Sn film separated from a NiFe film by an ultrathin Ag spacer can cause an extra damping in the NiFe film that is three times bigger than the intrinsic damping of the NiFe film. Such an extra damping is absent in structures where the α‐Sn film interfaces directly with a NiFe film, or is replaced by a β‐Sn film. The data suggest that the extra damping is associated with topologically nontrivial surface states in the topological Dirac semimetal phase of the α‐Sn film. This work suggests that, like topological insulators, topological Dirac semimetal α‐Sn may have promising applications in spintronics.

show abstract

Enhancement of the spin pumping efficiency by spin wave mode selection

Cited by 144 publications

References 21 publications

Spin Pumping and Enhanced Gilbert Damping in Thin Magnetic Insulator Films

Spin Pumping and Enhanced Gilbert Damping in Thin Magnetic Insulator Films

Spin Pumping at the Magnetic Insulator (YIG)/Normal Metal (Au) Interfaces

Large Damping Enhancement in Dirac‐Semimetal–Ferromagnetic‐Metal Layered Structures Caused by Topological Surface States

Contact Info

Product

Resources

About