Spin-wave population in nickel after femtosecond laser pulse excitation

Lenk, Benjamin; Eilers, Gerrit; Hamrle, Jaroslav; Münzenberg, Markus

doi:10.1103/physrevb.82.134443

Cited by 40 publications

(48 citation statements)

References 25 publications

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“…6 in Ref. [25]) is an experimental proof that the all-optical pump-probe technique gives no k selectivity not only in metals [38,39], where the penetration depth of light is smaller than the metal layer thickness, but also in semiconductors, where penetration depth of light is much larger than the layer thickness.…”

Section: A Sample Characterizationmentioning

confidence: 91%

“…These precession modes are the SWRs, i.e., spin waves (or magnons) that are selectively amplified by ful- filling the boundary conditions. In general, different magnetic boundary conditions lead to a different character of SWRs [26,[38][39][40][41][42][43][44][45]. In our case of a magnetically homogeneous [25] thin magnetic film with a thickness L, SWRs correspond to so-called perpendicular standing spin waves (PSSWs) where the wave vector k is quantized as k = nπ/L (where n is the mode number) [38][39][40][41].…”

Section: A Sample Characterizationmentioning

confidence: 99%

“…The applied all-optical pump-probe technique gives no k selectivity, as discussed in Refs. [38,39], and references therein. In the theoretical treatment of spin waves, PSSWs are obtained when the magnetic boundary conditions corresponding to a "free surface" with δM x,y /δz = 0 are considered [42].…”

Section: A Sample Characterizationmentioning

confidence: 99%

“…For the SWRs, where the local moments are no longer parallel (as will be seen in the inset in Fig. 8), restoring torques due to exchange interaction and internal magnetic dipolar interaction have to be included in the analysis [39][40][41]45]. For H ext along the [010] crystallographic direction (i.e., for ϕ H = π/2), Eq.…”

Section: Determination Of Magnetic Anisotropymentioning

confidence: 99%

“…For the case of MO data measured at μ 0 H ext = 250 mT, the damping constants obtained for modes with n = 0 and 155203-8 [39,42]) of the SWRs with n = 0 (uniform magnetization precession with zero k vector) and n = 1 (perpendicular standing spin wave with a wave vector k fulfilling the resonant condition kL = π ) in a magnetic film with a thickness L. (c) Normalized Fourier spectra computed for the depicted ranges of time delays from the measured MO data, which are shown in (a). (d) Dependence of the apparent damping constant (α n ) on the precession frequency for the uniform magnetization precession (n = 0) and the first SWR (n = 1).…”

Section: E Determination Of Gilbert Dampingmentioning

confidence: 99%

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Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As

et al. 2014

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We report on the determination of micromagnetic parameters of epilayers of the ferromagnetic semiconductor (Ga,Mn)As, which has an easy axis in the sample plane, and (Ga,Mn)(As,P), which has an easy axis perpendicular to the sample plane. We use an optical analog of ferromagnetic resonance where the laser-pulse-induced precession of magnetization is measured directly in the time domain. By the analysis of a single set of pump-and-probe magneto-optical data, we determined the magnetic anisotropy fields, the spin stiffness, and the Gilbert damping constant in these two materials. We show that incorporation of 10% of phosphorus in (Ga,Mn)As with 6% of manganese leads not only to the expected sign change of the perpendicular-to-plane anisotropy field but also to an increase of the Gilbert damping and to a reduction of the spin stiffness. The observed changes in the micromagnetic parameters upon incorporating P in (Ga,Mn)As are consistent with the reduced hole density, conductivity, and Curie temperature of the (Ga,Mn)(As,P) material. We also show that the apparent magnetization precession damping is stronger for the n = 1 spin wave resonance mode than for the n = 0 uniform magnetization precession mode.

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Section: A Sample Characterizationmentioning

confidence: 91%

Section: A Sample Characterizationmentioning

confidence: 99%

Section: A Sample Characterizationmentioning

confidence: 99%

Section: Determination Of Magnetic Anisotropymentioning

confidence: 99%

Section: E Determination Of Gilbert Dampingmentioning

confidence: 99%

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Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As

et al. 2014

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An Experiment‐Based Numerical Treatment of Spin Wave Modes in Periodically Porous Materials

Opdenbosch

Hukic-Markosian

Ott

et al. 2019

Physica Status Solidi (b)

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To determine a general correlation between structure and dynamic magnetic properties of porous materials, the frequencies of magnetic spin waves are studied by Brillouin light scattering from nickel inverse opals and backed up by micromagnetic simulations. Within the observed unit cell size regime between 400 and 800 nm, discrete thickness standing modes are found to change with unit cell size. By applying pair correlation functions of the inverse opal solid phase normal to the applied field to an equation for perpendicular standing modes, the directional and unit cell size‐dependent spectral intensities above the surface mode region can be traced. Thus, an accessible general approach for the prediction of standing spin waves in porous materials is obtained.

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Photo-Magnonics

Lenk

Garbs

Ulrichs

et al. 2012

Topics in Applied Physics

Self Cite

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In the framework of magnonics all-optical femtosecond laser experiments are used to study spin waves and their relaxation paths. Magnonic crystal structures based on antidots allow the control over the spin-wave modes. In these twodimensional magnetic metamaterials with periodicities in the wave-length range of dipolar spin waves the spin-wave bands and dispersion are modified. Hence, a specific selection of spin-wave modes excited by laser pulses is possible. Different to photonics, the modes depend strongly on the strength of the magneto-static potential at around each antidot site -the dipolar field. While this may lead to a mode localization, also for filling fractions around or below 10%, Bloch states are found in low damping ferromagnetic metals. In this chapter, an overview of these mechanisms is given and the connection to spin-wave band spectra calculated from an analytical model is established. Namely, the plane-wave method yields flattened bands as well as band gaps at the antidot lattice Brillouin zone boundary.

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Spin-wave population in nickel after femtosecond laser pulse excitation

Cited by 40 publications

References 25 publications

Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As

Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As

An Experiment‐Based Numerical Treatment of Spin Wave Modes in Periodically Porous Materials

Photo-Magnonics

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