Terahertz spinplasmonics in random ensembles of Ni and Co microparticles

摘要: Terahertz time-domain spectroscopy has found widespread application due to a number of attractive features including phase-sensitive detection and subpicosecond temporal resolution. Recently, the this technique study ensembles sub-wavelength ferromagnetic particles resulted in observation novel unusual effects. The shape, relative transmission amplitude, time delay broadband terahertz waveform were sensitive magnitude direction an applied magnetic field magnetization states particles. Furthermore, addition thin coating nonmagnetic metal (Au) at surface had profound effect on these characteristics. To better understand new phenomena, investigation is presented which test range extended, significantly larger as well both polarities. By sweeping con...