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Article Dans Une Revue Physical Review Applied Année : 2020

Determining Key Spin-Orbitronic Parameters via Propagating Spin Waves

Résumé

We characterize spin-wave propagation and its modification by an electrical current in permalloy(Py)/Pt bilayers with Py thickness between 4 and 20 nm. First, we analyze the frequency nonreciprocity of surface spin waves and extract from it the interfacial Dzyaloshinskii-Moriya interaction constant D s accounting for an additional contribution due to asymmetric surface anisotropies. Second, we measure the spin-wave relaxation rate and deduce from it the Py/Pt spin-mixing conductance g ↑↓ eff. Last, applying a dc electrical current, we extract the spin Hall conductivity σ SH from the change of spin-wave relaxation rate due to the spin Hall spin-transfer torque. We obtain a consistent picture of the spin-wave propagation data for different film thicknesses using a single set of parameters D s = 0.25 pJ/m, g ↑↓ eff = 3.2 × 10 19 m −2 and σ SH = 4 × 10 5 S/m.
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Dates et versions

hal-02996525 , version 1 (09-11-2020)

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O. Gladii, M. Collet, Y. Henry, J.-V. Kim, A. Anane, et al.. Determining Key Spin-Orbitronic Parameters via Propagating Spin Waves. Physical Review Applied, 2020, 13 (1), ⟨10.1103/PhysRevApplied.13.014016⟩. ⟨hal-02996525⟩
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