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Feasible Conditions for Magnetostatic Wave Envelope Solitons and Their Formation under Optimal Conditions

静磁波包络孤子的可行条件及其在最佳条件下的形成

基本信息

批准号：
09650062
负责人：
OHKAWA Sumio
金额：
$ 2.05万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650062/
关键词：
magnetostatic waves yttrium iron garnet films envelope solitons nonlinear Schrodinger equation linewidth bright soliton dark soliton adjacent metal plane 初期パルス波形イットリウム・鉄・ガ-ネット膜非線形シュレ-ディンガー方程式

项目摘要

Although yttrium iron garnet (YIG) films are widely used for microwave resonators owing to their narrow ferromagnetic resonance linewidth, it is not enough narrow for the magnetostatic wave (MSW) envelope solitons to propagate on the YIG films almost free of propagation losses.The nonlinear Schr_dinger (NLS) equation with the third order dispersion and dissipative effects has been used to describe MSW envelope solitons. The split-step Fourier method has been used to solve the NLS equation. In order to observe a soliton-like behavior in experiments, we must make the dispersion of the MSW so high that the waveform of an input pulse may make a sufficiently rapid change and the MSW soliton formation may be completed before the dissipative effect becomes prevailing. On the other hand, the stronger the dispersion, the more power is needed to form a soliton.Feasible conditions for MSW soliton formation and propagation have been discussed by quantitatively investigating the decay features of MSW solitons. The amplitude decay rate of MSW wave packets has been found to be dependent on the input power level, so is the broadening rate of their full-width at half maximum (FWHM), and it should be emphasized that the increase of input power has further been proved to have an effect on the damping of MSW solitons which is equivalent to the decrease of loss.The magnetostatic surface wave (MSSW) bright solitons can be formed if the dispersion is controlled by putting a metal plane close to or a metal grating on the surface of a YIG film.The use of so-called soliton effects in a YIG film has been shown to be a promising technique for production of magnetostatic wave (MSW) pulses with at least as short width as 1 ns.

钇铁石榴石（YIG）薄膜由于其窄的铁磁共振线宽而被广泛应用于微波谐振器中，但由于YIG薄膜的铁磁共振线宽不够窄，静磁波（MSW）包络孤子在YIG薄膜上的传播几乎没有损耗，因此采用考虑三阶色散和耗散效应的非线性薛定谔（NLS）方程来描述MSW包络孤子。采用分步傅里叶方法求解NLS方程。为了在实验中观察到类似孤子的行为，我们必须使MSW的色散足够高，使得输入脉冲的波形可以做出足够快的变化，并且MSW孤子的形成可以在耗散效应变得占优势之前完成。另一方面，色散越强，形成孤子所需的能量越大，通过对MSW孤子的衰减特性的定量研究，讨论了MSW孤子形成和传播的可行条件。MSW波包的振幅衰减率和半高宽展宽率与输入功率有关，进一步证明了输入功率的增加对MSW孤子的阻尼作用相当于损耗的减小。通过在YIG薄膜表面放置金属平面或金属光栅来控制YIG薄膜的色散，可以形成明亮的孤子，利用YIG薄膜中的孤子效应可以产生脉宽至少为1ns的静磁波脉冲。