Magnetostatic spin waves in (111)-oriented thin garnet films with combined cubic and uniaxial anisotropies

Gieniusz, R.; Smoczyński, Lech

doi:10.1016/0304-8853(87)90172-7

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…8 In the DE calculation, the dipolar approximation was used and the magnetic anisotropy was neglected. Further calculations were performed by many authors, [9][10][11][12] so as to include the magnetic exchange, the volume as well as surface anisotropy, and dissipative effects. In flat unbounded films various modes are expected to propagate with wave vectors in the plane of the film.…”

Section: Introductionmentioning

confidence: 99%

Effect of anisotropy on Brillouin spectra of stripe-structured cobalt layers

1999

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We present a comparative study of the magnetic Brillouin spectra of arrays of stripe-structured Co layers and of continuous unpatterned Co films. These spectra mainly differ from each other through the occurrence of an additional line on the low-frequency side for the patterned films. This feature is related to magnetic eigenmodes arising from the uniform bulk mode of the continuous film when taking into account the magnetic anisotropy in the dipolar approximation: the simultaneous presence of magnetic anisotropy and of structuration is needed to allow for light scattering by such pseudobulk modes. In the case of continuous films the spectral profiles that contain lines related to both the Damon-Eshbach and to standing spin waves are quantitatively interpreted. An approach to the magnetic eigenmodes observed in the stripes is developed; it is derived from a calculation that uses the dipolar approximation and includes anisotropy for cylinders with elliptical cross section. Finally, the influence of the demagnetizing field upon the spectra of the patterned layers is evidenced and discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of anisotropy on Brillouin spectra of stripe-structured cobalt layers

1999

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“…In the simplest case of ferromagnetic resonance (FMR) excitation, i.e. all spins precess in phase, the dispersion is given by Kittel's formula 8 (1) with the gyromagnetic ratio γ = 28 GHz/T, the external magnetic field H ext , the saturation magnetization M S and the anisotropy field H a 9,10 . Here, M S and H a depend on the temperature and cause the frequency shift in the resonance spectrum.…”

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confidence: 99%

Spin-wave propagation and transformation in a thermal gradient

Obry

Vasyuchka

Chumak

et al. 2012

Applied Physics Letters

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The influence of a thermal gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.Comment: 4 pages, 4 figure

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“…The dispersion of SWs ω ( k ) was calculated from the transcendental equations for the backward magnetostatic spin waves 31 .…”

Section: Methodsmentioning

confidence: 99%

“…The function θ 1 S ( r , t ) is given by integration over wavenumbers k = ( k x , k y ) 16 : where β is a proportionality coefficient, is the Fourier transform of h ( r ) in k -space, ω ( k ) is the SW frequency, and α is the Gilbert damping constant. The dispersion of SWs ω ( k ) was calculated from the transcendental equations for the backward magnetostatic spin waves 31 .…”

Section: Methodsmentioning

confidence: 99%

Generation of spin waves by a train of fs-laser pulses: a novel approach for tuning magnon wavelength

Savochkin

Jäckl

Belotelov

et al. 2017

Sci Rep

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Currently spin waves are considered for computation and data processing as an alternative to charge currents. Generation of spin waves by ultrashort laser pulses provides several important advances with respect to conventional approaches using microwaves. In particular, focused laser spot works as a point source for spin waves and allows for directional control of spin waves and switching between their different types. For further progress in this direction it is important to manipulate with the spectrum of the optically generated spin waves. Here we tackle this problem by launching spin waves by a sequence of femtosecond laser pulses with pulse interval much shorter than the relaxation time of the magnetization oscillations. This leads to the cumulative phenomenon and allows us to generate magnons in a specific narrow range of wavenumbers. The wavelength of spin waves can be tuned from 15 μm to hundreds of microns by sweeping the external magnetic field by only 10 Oe or by slight variation of the pulse repetition rate. Our findings expand the capabilities of the optical spin pump-probe technique and provide a new method for the spin wave generation and control.

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Magnetostatic spin waves in (111)-oriented thin garnet films with combined cubic and uniaxial anisotropies

Cited by 13 publications

References 10 publications

Effect of anisotropy on Brillouin spectra of stripe-structured cobalt layers

Effect of anisotropy on Brillouin spectra of stripe-structured cobalt layers

Spin-wave propagation and transformation in a thermal gradient

Generation of spin waves by a train of fs-laser pulses: a novel approach for tuning magnon wavelength

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