FMR line shape e?ect on spin pumping in bilayer structures

摘要

Pure spin current induced by ferromagnetic resonance (FMR) excitation in thin-?lm heterostructures consisting of ferromagnetic (FM) and normal metal (NM) layers is studied as a function of FMR line shape and width. Experiments were carried out with thin ?lms of ferromagnetic La2/3Sr1/3MnO3 (LSMO) grown epitaxially on NdGaO3 substrate and covered with Pt. The spin current injected into the NM layer was measured using the inverse spin Hall e?ect (ISHE) in the temperature range of 100-350K. The samples under study revealed di?erent width of the FMR line, which was attributed to inhomogeneous broadening with a speci?c Voigt shape of the ISHE signal. To take this e?ect into account, substantial corrections are proposed to the existing theory of spin pumping.