| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Outline of Final Research Achievements |
Bose Einstein condensation of a magnon system driven by microwave at room temperature has been reported with using the Brillouin light scattering technique. Another effective experiment about a nonequilibrium magnon system is to study microwave radiations from a parametrically excited sample. As a viewpoint of developing new nonlinear microwave devices, microwave radiation from parametrically excited magnons was studied experimentally. Parallel pumping excitations and transverse pumping at the first-order Suhl instability were carried out on a ferromagnetic yttrium iron garnet (YIG). A high sensitivity microwave circuit was used to detect spectra of radiation microwave. At high pumping power, multi-frequency components are observed simultaneously. The spectra depend on static field, or magnetostatic modes. These spectra and the time series of microwave radiation show that a four-magnon scattering is important in a nonlinear relaxation process.
|
