Measurement of spin wave instability magnon distributions for subsidiary absorption in yttrium iron garnet films by Brillouin light scattering

Kaboš, Pavel; Wiese, G.; Ce, Patton

doi:10.1103/physrevlett.72.2093

Cited by 27 publications

(17 citation statements)

References 21 publications

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“…(1,2), only with one pair of parametric SW, can describe the experimental situation. However, for the case of parallel pumping and constant in time rf field amplitude it may be shown that (slightly simplifying the problem) only one SW pair is excited just above the instability threshold [15], while the excitation of other SW pairs requires signiflcantly increased pumping power; similar results were obtained experimentally for the perpendicular resonance [36]. As in our equations of motion O0I is observed when (h(t))t exceeds only a little the instability threshold, it is reasonable to assume that only one pair of SW is excited.…”

Section: Discussionsupporting

confidence: 63%

On-Off Intermittency in Randomly Driven Nonlinear Ferromagnetic Resonance

Krawiecki

Sukiennicki

1996

Acta Phys. Pol. A

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Simple models of nonlinear ferromagnetic resonance are considered which describe perpendicular resonance and parallel pumping with the rf field amplitude changing randomly and chaotically in time. On-off intermittency is obtained from the numerical solution of the equations of motion for the spin-wave amplitudes when the mean value of the rf field amplitude exceeds the Suhl instability threshold. Possible experimental applications are discussed.

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Section: Discussionsupporting

confidence: 63%

On-Off Intermittency in Randomly Driven Nonlinear Ferromagnetic Resonance

Krawiecki

Sukiennicki

1996

Acta Phys. Pol. A

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“…To determine the actual wave vectors of the pumped spin waves, an additional experimental technique, Brillouin light scattering, has been used. 24 This experiment, however, may be very difficult for the cylindrical surface micrometric radius.…”

Section: -mentioning

confidence: 99%

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

et al. 2009

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The giant magnetoimpedance of an 8.5 m glass-covered amorphous microwire was investigated in the frequency range of 10 MHz-3.5 GHz. It was found that when the exciting microwave current exceeds some threshold value, a periodic fine structure appears in the frequency dependence of the complex impedance. The appearance of this nonlinear phenomenon is interpreted to be a consequence of the parametric excitation of standing spin waves. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3079659͔ Nonlinear magnetization dynamics, which is one of the fundamental issues in applied magnetism, has recently received increasing attention in connection with the advances in magnetic storage technologies and spintronics. 1 Materials and devices used in these areas typically have nanoscale dimensions and operate in the gigahertz range. The understanding of magnetization dynamics is of great importance for these technologies. The nonlinear behavior of ferrites and garnets was systematically investigated during the 1950s and 1960s, particularly in connection with the development of radar and microwave techniques. With increasing interest in metallic ferromagnets, nowadays, new experimental methods are desirable for investigation of the nonlinear magnetic phenomena in these materials. One such technique is the giant magnetoimpedance ͑GMI͒.GMI comes from the dependence of electromagnetic skin depth in soft magnetic metals on the external dc magnetic field. 2 It has been shown by Yelon et al. 3 that the theoretical description of GMI, which is based on the simultaneous solution of Maxwell equations and the LandauLifshitz ͑LL͒ equation of motion is similar to the theory of ferromagnetic resonance ͑FMR͒ in metals. The LL is generally a nonlinear equation. In the small signal limit ͑low ac excitation current͒, where the LL equation can be linearized, this theoretical approach provides a very good explanation for the observed GMI behavior. 4 Nevertheless, at high excitation current, where the nonlinearity of LL equation must be taken into account, nonlinear effects should appear. Considering the correspondence between GMI and FMR one can expect that various nonlinear effects, similar to those observed in FMR, 5 also take place in the GMI. Because of the large damping of magnetization motion, the standard nonlinear FMR experiments in ferromagnetic metals require high power microwave sources. 6 In GMI measurements, however, the conditions for nonlinear behavior can already be achieved with exciting currents of a few milliampere. 7 Among various nonlinear phenomena, "frequency multiplication" ͑higher order harmonics of GMI signal͒ has already been investigated. [8][9][10][11][12][13][14][15] Although the similarity between the experimental configurations for transverse GMI in metallic ribbons and parallel pumping experiments in ferromagnetic insulators has already been pointed out by Yelon et al., 7 the parametric excitation of spin waves, 16 and other known nonlinear phenomena have not been reported so far.The aim of this paper is to ...

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“…The minimum rf field amplitude necessary for the occurrence of the instability is called the instability threshold. Usually, only one parametric mode pair goes unstable exactly at the threshold and its amplitude grows exponentially in time, but it was verified experimentally that other mode pairs may also be excited as the rf field amplitude rises [11]. Nonlinear interactions among the modes lead to the appearance of the auto-oscillations and chaos in the time dependence of the magnetization.…”

Section: Introductionmentioning

confidence: 99%

On-Off Intermittency and Peculiar Properties of Attractors in a Simple Model of Chaos in Ferromagnetic Resonance

Krawiecki

Sukiennicki

1995

Acta Phys. Pol. A

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Some non-trivial phenomena in chaos in ferromagnetic resonance above the first-order Suhl instability threshold are obtained numerically from a simple model of three interacting modes. They include sudden changes of the correlation dimension of the attractor and the largest Lyapunov exponent with the rise of the rf fleld amplitude. Numerical evidence is provided that these effects may result from the on-off intermittency in the system of interacting modes. These results are qualitatively similar to the experimental ones, known from the literature, obtained for in-plane magnetized thin films.

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Measurement of spin wave instability magnon distributions for subsidiary absorption in yttrium iron garnet films by Brillouin light scattering

Cited by 27 publications

References 21 publications

On-Off Intermittency in Randomly Driven Nonlinear Ferromagnetic Resonance

On-Off Intermittency in Randomly Driven Nonlinear Ferromagnetic Resonance

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

On-Off Intermittency and Peculiar Properties of Attractors in a Simple Model of Chaos in Ferromagnetic Resonance

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