6533b86dfe1ef96bd12c9de7
RESEARCH PRODUCT
false
subject
010302 applied physicsMaterials sciencePhysics and Astronomy (miscellaneous)SpintronicsField (physics)business.industryTerahertz radiationPhysics::Optics02 engineering and technologyDielectricPhoton energy021001 nanoscience & nanotechnology01 natural sciencesCondensed Matter::Materials ScienceWavelengthFerromagnetism0103 physical sciencesOptoelectronics0210 nano-technologybusinessExcitationdescription
We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic CoFeB layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation is essentially flat for excitation by 150 fs pulses with center wavelengths ranging from 900 to 1500 nm, demonstrating that the spin current does not depend strongly on the pump photon energy. We show that the inclusion of dielectric overlayers of TiO2 and SiO2, designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of up to two in field.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-28 | Applied Physics Letters |