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Picosecond Spin Seebeck Effect
Kimling, Johannes,Choi, Gyung-Min,Brangham, Jack T.,Matalla-Wagner, Tristan,Huebner, Torsten,Kuschel, Timo,Yang, Fengyuan,Cahill, David G. American Physical Society 2017 Physical Review Letters Vol.118 No.5
<P>We report time-resolved magneto-optic Kerr effect measurements of the longitudinal spin Seebeck effect in normal metal/Y3Fe5O12 bilayers driven by an interfacial temperature difference between electrons and magnons. The measured time evolution of spin accumulation induced by laser excitation indicates transfer of angular momentum across normal metal/Y3Fe5O12 interfaces on a picosecond time scale, too short for contributions from a bulk temperature gradient in an yttrium iron garnet. The product of spin-mixing conductance and the interfacial spin Seebeck coefficient determined is of the order of 10(8) Am-2K-1.</P>
Terahertz spin-orbital excitations in the paramagnetic state of multiferroicSr2FeSi2O7
Mai, Thuc T.,Svoboda, C.,Warren, M. T.,Jang, T.-H.,Brangham, J.,Jeong, Y. H.,Cheong, S.-W.,Valdé,s Aguilar, R. American Physical Society 2016 Physical Review B Vol.94 No.22
<P>We studied the novel multiferroic material Sr2FeSi2O7 and found three absorption modes above the magnetic ordering transition temperature using time-domain terahertz spectroscopy. These absorption modes can be explained as the optical transitions between the spin-orbit coupling and crystal-field split 3d(6) Fe2+ ground-state term in this material. Consideration of the compressed tetrahedral environment of the Fe2+ site is crucial to understand the excitations. We point out, however, discrepancies between the single-site atomic picture and the experimental results.</P>