Spin-Wave Resonance Fields, Linewidths, and Intensities of a Permalloy Film: Theory and Experiment

Bailey, G. C.; Vittoria, C.

doi:10.1103/physrevlett.28.100

Cited by 34 publications

(10 citation statements)

References 8 publications

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“…The different apparent damping of the modes at lower frequency can be again ascribed to the presence of an extrinsic contribution to the damping coefficient for the SWR modes. This extrinsic damping probably originates from small variations of the sample thickness (<1 nm) within the laser spot size [58] and/or from the presence of a weak bulk inhomogeneity [43], which is apparent as small variations of H n . The frequency spacing and the PSSW character of the SWR modes is insensitive to such small variations of H n , but the resulting frequency variations [see Eq.…”

Section: E Determination Of Gilbert Dampingmentioning

confidence: 99%

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: E Determination Of Gilbert Dampingmentioning

confidence: 99%

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

et al. 2014

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“…This indicates that the k-dependent linewidth found in our studies in thin films is extrinsic. It most probably arises either from the inhomogeneous broadening associated with thickness nonuniformity, [41] or from the spin-wave scattering on surface and bulk disorder. [45,46,47] If we take an extreme approach and assume only thickness nonuniformity, then Ref.…”

Section: Linewidthmentioning

confidence: 99%

“…[45,46,47] If we take an extreme approach and assume only thickness nonuniformity, then Ref. [41] yields…”

Section: Linewidthmentioning

confidence: 99%

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Spin-wave resonances inLa0.7Sr0.3MnO3films: Measurement of spin-wave stiffness and anisotropy field

et al. 2007

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We studied magnetic field dependent microwave absorption in epitaxial La 0.7 Sr 0.3 MnO 3 films using an X-band Bruker ESR spectrometer. By analyzing angular and temperature dependence of the ferromagnetic and spin-wave resonances we determine spin-wave stiffness and anisotropy field.The spin-wave stiffness as found from the spectrum of the standing spin-wave resonances in thin films is in fair agreement with the results of inelastic neutron scattering studies on a single crystal of the same composition [Vasiliu-Doloc et al., J. Appl. Phys. 83, 7343 (1998)].

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“…These intensities are generally functions of metallicity of the samples and measurement frequency. 20,21 From the H n vs n 2 plots at several temperatures, we have extracted the spin wave stiffness constant D(T), which for the 200 nm thick film at a reduced temperature (T/T C ) of 0.9 and 0.8 is 70 and 22 The temperature dependence of D(T) over a limited range of temperature is shown in Fig. 9.…”

Section: Spin Wave Mode Analysismentioning

confidence: 99%

Magnetization dynamics in La0.67Ca0.33MnO3 epitaxial films probed with resonant and non-resonant microwave absorption

Porwal

Pant

Budhani

2015

Journal of Applied Physics

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Exchange bias effect in epitaxial La0.67Ca0.33MnO3/SrMnO3 thin film structure J. Appl. Phys. 116, 083908 (2014) Temperature (T) dependent microwave absorption measurements are performed on La 0.67 Ca 0.33 MnO 3 (LCMO) epitaxial thin films of thickness 100 and 200 nm in an electron paramagnetic resonance spectrometer operating in X-band. The resonant absorption peak is monitored for out-of-plane (H ? ) and in-plane (H k ) dc magnetic field (H) as the system goes through magnetic ordering. These data suggest a resilient transformation to the ferromagnetic (FM) phase in the vicinity of the Curie temperature (T C ), indicative of a phase separation, which is dominant in the thinner film. The saturation magnetization is calculated from SQUID magnetometry on the same film. A pronounced zero-field absorption is seen in H k geometry displaying anomalous growth in 100 nm film at T < T C . This feature is correlated with the magneto-conductivity of the manganite which is colossal in the vicinity of T C in the well-ordered film of thickness 200 nm. Signature of standing spin wave modes is seen in H ? measurements which are analyzed to calculate the spin wave stiffness constant D(T) in the limit of zero temperature. The same is also inferred from the decay of equilibrium magnetization in the framework of Bloch law. These studies reveal that a bulk like LCMO is obtained in the fully relaxed thicker films. V C 2015 AIP Publishing LLC.

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Spin-Wave Resonance Fields, Linewidths, and Intensities of a Permalloy Film: Theory and Experiment

Cited by 34 publications

References 8 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

Spin-wave resonances inLa0.7Sr0.3MnO3films: Measurement of spin-wave stiffness and anisotropy field

Magnetization dynamics in La0.67Ca0.33MnO3 epitaxial films probed with resonant and non-resonant microwave absorption

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