| Project/Area Number |
09650062
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Chiba University |
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Principal Investigator |
OHKAWA Sumio Chiba University, Faculty of Engineering, Professor, 工学部, 教授 (50009247)
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| Co-Investigator(Kenkyū-buntansha) |
GUAN Ning Chiba University, Faculty of Engineering, Research Associate, 工学部, 助手 (20234148)
YASHIRO Ken'ichiro Chiba University, Faculty of Engineering, Professor, 工学部, 教授 (00125965)
橋本 研也 千葉大学, 工学部, 助教授 (90134353)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | 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 |
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| Research Abstract |
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.
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