Different dynamic and static magnetic anisotropy in thin Permalloy™ films

Lopusnik, R.; Nibarger, J. P.; Silva, Thomas J.; Celiński, Z.

doi:10.1063/1.1587255

Cited by 61 publications

(33 citation statements)

References 7 publications

(7 reference statements)

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“…The value obtained is more than twice the value determined from static measurements. This result confirms results obtained by Lopusnik et al, 19 where a rotatable contribution to the anisotropy was observed for sputtered permalloy films.…”

Section: Resultssupporting

confidence: 83%

Large-angle magnetization dynamics investigated by vector-resolved magnetization-induced optical second-harmonic generation

Gerrits

Silva

Nibarger

et al. 2004

Journal of Applied Physics

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We examine the relationship between nonlinear magnetic responses and the change in the Gilbert damping parameter ␣ for patterned and unpatterned thin Permalloy films when subjected to pulsed magnetic fields. An improved magnetization-vector-resolved technique utilizing magnetization-induced optical second-harmonic generation was used to measure magnetization dynamics after pulsed-field excitation. The magnetization excitations were achieved with pulsed fields aligned parallel to the hard axis of thin permalloy ͑Ni 80 Fe 20 ͒ films while a dc bias field is applied along the easy axis. At low bias fields, ␣ was inversely related to the bias field, but there was no significant reduction in the absolute value of the magnetization, as might be expected if there was significant spin-wave generation during the damping process. We discuss the discrepancies between data obtained by ferromagnetic resonance, whereby spin-wave generation is prevalent, and pulsed-field studies, with the conclusion that fundamental differences between the two techniques for the excitation of the ferromagnetic spin system might explain the different proclivities toward spin-wave generation manifest in these two experimental methods.

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Section: Resultssupporting

confidence: 83%

Large-angle magnetization dynamics investigated by vector-resolved magnetization-induced optical second-harmonic generation

Gerrits

Silva

Nibarger

et al. 2004

Journal of Applied Physics

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“…This is in agreement with earlier studies by Lopusnik et al 12 and Schneider et al 13 Fig. 2 as a function of frequency (down triangles).…”

Section: A Small Angle Responsesupporting

confidence: 83%

Large-angle magnetization dynamics measured by time-resolved ferromagnetic resonance

et al. 2006

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A time-resolved ferromagnetic resonance technique was used to investigate the magnetization dynamics of a 10 nm thin Permalloy film. The experiment consisted of a sequence of magnetic field pulses at a repetition rate equal to the magnetic system's resonance frequency. We compared data obtained by this technique with conventional pulsed inductive microwave magnetometry. The results for damping and frequency response obtained by these two different methods coincide in the limit of a small angle excitation. However, when applying large amplitude field pulses, the magnetization had a non-linear response. We speculate that one possible cause of the nonlinearity is related to self-amplification of incoherence, known as the Suhl instabilities.2

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“…The slight difference between these two FMR frequencies could be due to the difference between static and dynamic magnetic anisotropies of those films, and it has been observed in FeNi film. 37 These high frequency magnetic properties in this study are similar with previous FeGaB films. 22,23 The θ H dependence of the ∆H pp for the three films is shown in Figs.…”

Section: Resultssupporting

confidence: 80%

Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

et al. 2017

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A series of FeGa, FeGaN and FeGaB films with varied oblique angles were deposited by sputtering method on silicon substrates, respectively. The microstructure, soft magnetism, microwave properties, and damping factor for the films were investigated. The FeGa films showed a poor high frequency magnetic property due to the large stress itself. The grain size of FeGa films was reduced by the additional N element, while the structure of FeGa films was changed from the polycrystalline to amorphous phase by the involved B element. As a result, N content can effectively improve the magnetic softness of FeGa film, but their high frequency magnetic properties were still poor both when the N2/Ar flow rate ratio is 2% and 5% during the deposition. The additional B content significantly led to the excellent magnetic softness and the self-biased ferromagnetic resonance frequency of 1.83 GHz for FeGaB film. The dampings of FeGa films were adjusted by the additional N and B contents from 0.218 to 0.139 and 0.023, respectively. The combination of these properties for FeGa films are helpful for the development of magnetostrictive microwave devices.

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Different dynamic and static magnetic anisotropy in thin Permalloy™ films

Cited by 61 publications

References 7 publications

Large-angle magnetization dynamics investigated by vector-resolved magnetization-induced optical second-harmonic generation

Large-angle magnetization dynamics investigated by vector-resolved magnetization-induced optical second-harmonic generation

Large-angle magnetization dynamics measured by time-resolved ferromagnetic resonance

Tuning high frequency magnetic properties and damping of FeGa, FeGaN and FeGaB thin films

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