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Spin wave propagation and its modification by an electrical current in Py/Al2O3, Py/Pt and Fe/MgO films

Abstract : Propagating spin wave measurements were realised to characterize two spin-orbit related phenomena, as well as spin dependent electrical transport. The effects of spin-orbit coupling have been studied in nickel-iron/platinum bilayers. It has been shown that in these films the frequencies of two counter-propagating spin waves are not the same, which is attributed to the combined effects of a chiral magnetic interaction named Dzyaloshinskii-Moriya interaction and an asymmetry of the magnetic properties across the film thickness. By applying an electrical current in such system we have observed a modification of the spin wave relaxation rate due to the spin transfer torque induced by spin Hall effect. On the other hand, from the study of spin wave propagation in thin epitaxial iron films at room temperature, a degree of spin polarization of the electrical current of 83% was extracted, which is attributed to a significant spin-asymmetry of the electron-phonon coupling.
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Olga Gladii. Spin wave propagation and its modification by an electrical current in Py/Al2O3, Py/Pt and Fe/MgO films. Condensed Matter [cond-mat]. Université de Strasbourg, 2016. English. ⟨NNT : 2016STRAE038⟩. ⟨tel-01724624⟩

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