Search results for "0299 Other Physical Sciences"

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Femtosecond formation dynamics of the spin Seebeck effect revealed by terahertz spectroscopy

2018

Understanding the transfer of spin angular momentum is essential in modern magnetism research. A model case is the generation of magnons in magnetic insulators by heating an adjacent metal film. Here, we reveal the initial steps of this spin Seebeck effect with <27fs time resolution using terahertz spectroscopy on bilayers of ferrimagnetic yttrium-iron garnet and platinum. Upon exciting the metal with an infrared laser pulse, a spin Seebeck current $j_\textrm{s}$ arises on the same ~100fs time scale on which the metal electrons thermalize. This observation highlights that efficient spin transfer critically relies on carrier multiplication and is driven by conduction electrons scattering …

MagnetismTerahertz radiation0299 Other Physical SciencesScienceGeneral Physics and AstronomyFOS: Physical sciencesPhysics::Optics02 engineering and technology01 natural sciencesGeneral Biochemistry Genetics and Molecular BiologyArticleCondensed Matter::Materials ScienceFerrimagnetism5370103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)ddc:530010306 general physicsSpin (physics)lcsh:ScienceTerahertz opticsPhysicsSpin pumpingCondensed Matter - Materials ScienceMultidisciplinaryCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsMagnonFar-infrared laserQMaterials Science (cond-mat.mtrl-sci)General ChemistrySpintronics021001 nanoscience & nanotechnology3. Good healthTerahertz spectroscopy and technologylcsh:QCondensed Matter::Strongly Correlated Electrons0210 nano-technology
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