Spectrum and linear excitation of spin waves in ferromagnetic films

Kalinikos, B. A.

doi:10.1007/bf00941342

Cited by 75 publications

(113 citation statements)

References 16 publications

Supporting

Mentioning

106

Contrasting

Order By: Relevance

“…The Green's function ( , ', , ') e G y y x x is obtained from (17,23) by considering the electric field of dynamic magnetisation at the point (y,x) of the strip cross-section, provided that the dynamic magnetisation is driven by an infinitely thin wire of current at the point (y',x'), also belonging to the same cross-section.…”

Section: B Radiation Lossesmentioning

confidence: 99%

“…A drawback of the constructed theory is that it is not self-consistent. It uses the same approach as previously employed to calculate the impedance of microstip transducers of travelling spin waves in thick magneto-insulating films [22,23]. The central point of this approach is assumption of some realistic distribution for the microwave current density across the width of a microstrip ("Given Current Density" (GCD) method).…”

Section: Introductionmentioning

confidence: 99%

“…In the framework of the self-consistent approach the distribution of the microwave current density is obtained by solving an integral equation. Then the found distribution is used to calculate the impedance with one of the same GCD theories [22,23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Kostylev

2016

Journal of Applied Physics

View full text Add to dashboard Cite

Abstract. We constructed a quasi-analytical self-consistent model of the striplinebased broadband ferromagnetic resonance (FMR) measurements of ferromagnetic films. Exchange-free description of magnetization dynamics in the films allowed us to obtain simple analytical expressions. They enable quick and efficient numerical simulations of the dynamics. With this model we studied the contribution of radiation losses to the ferromagnetic resonance linewidth, as measured with the stripline FMR. We found that for films with large conductivity of metals the radiation losses are significantly smaller than for magneto-insulating films. Excitation of microwave eddy currents in these materials contributes to the total microwave impedance of the system. This leads to impedance mismatch with the film environment resulting in decoupling of the film from the environment and, ultimately, to smaller radiation losses. We also show that the radiation losses drop with an increase in the stripline width and when the sample is lifted up from the stripline surface. Hence, in order to eliminate this measurement artefact one needs to use wide striplines and introduce a spacer between the film and the sample surface. The radiation losses contribution is larger for thicker films.

show abstract

Section: B Radiation Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Kostylev

2016

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…An expression similar to the expression (50) was first obtained in a different way in [35]. Note that the whole wave factor in the far zone is…”

Section: Appendix Amentioning

confidence: 71%

Resonant and nonresonant scattering of dipole-dominated spin waves from a region of inhomogeneous magnetic field in a ferromagnetic film

et al. 2007

View full text Add to dashboard Cite

The transmission of a dipole-dominated spin wave in a ferromagnetic film through a localised inhomogeneity in the form of a magnetic field produced by a dc current through a wire placed on the film surface was studied experimentally and theoretically. It was shown that the amplitude and phase of the transmitted wave can be simultaneously affected by the current induced field, a feature that will be relevant for logic based on spin wave transport.The direction of the current creates either a barrier or well for spin wave transmission. The main observation is that the current dependence of the amplitude of the spin wave transmitted through the well inhomogeneity is non-monotonic. The dependence has a minimum and an additional maximum. A theory was constructed to clarify the nature of the maximum. It shows that the transmission of spin waves through 1 Both authors contributed equally to the work

show abstract

“…The last term is the dynamic field, h d (r,t), induced by dipole-dipole interactions, where G xy is the upper 2 × 2 part of the dipole-dipole tensorial Green's function G ξηζ in the magnetostatic approximation (see Ref. [34]) rotated to the xyz coordinate system (see Appendix for coordinate-transformation matrices) [35]. The effect of the dipolar interaction on the spin-wave spectrum depends on the orientation of the internal field with respect to both the interface normal of the thin film,ξ , and the in-plane spin-wave propagation direction,ζ .…”

Section: Equations Of Motionmentioning

confidence: 99%

Spin pumping, dissipation, and direct and alternating inverse spin Hall effects in magnetic-insulator/normal-metal bilayers

Kapelrud

Brataas

2017

Phys. Rev. B

View full text Add to dashboard Cite

We theoretically consider the spin-wave mode-and wavelength-dependent enhancement of the Gilbert damping in magnetic insulator-normal metal bilayers due to spin pumping as well as the enhancement's relation to direct and alternating inverse spin Hall voltages in the normal metal. In the long-wavelength limit, including long-range dipole interactions, the ratio of the enhancement for transverse volume modes to that of the macrospin mode is equal to two. With an out-of-plane magnetization, this ratio decreases with both an increasing surface anisotropic energy and mode number. If the surface anisotropy induces a surface state, the enhancement can be an order of magnitude larger than for the macrospin. With an in-plane magnetization, the induced dissipation enhancement can be understood by mapping the anisotropy parameter to the out-of-plane case with anisotropy. For shorter wavelengths, we compute the enhancement numerically and find good agreement with the analytical results in the applicable limits. We also compute the induced direct-and alternating-current inverse spin Hall voltages and relate these to the magnetic energy stored in the ferromagnet. Because the magnitude of the direct spin Hall voltage is a measure of spin dissipation, it is directly proportional to the enhancement of Gilbert damping. The alternating spin Hall voltage exhibits a similar in-plane wave-number dependence, and we demonstrate that it is greatest for surface-localized modes.

show abstract

Spectrum and linear excitation of spin waves in ferromagnetic films

Cited by 75 publications

References 16 publications

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Resonant and nonresonant scattering of dipole-dominated spin waves from a region of inhomogeneous magnetic field in a ferromagnetic film

Spin pumping, dissipation, and direct and alternating inverse spin Hall effects in magnetic-insulator/normal-metal bilayers

Contact Info

Product

Resources

About