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Determination of spin Hall angle, spin mixing conductance, and spin diffusion length in CoFeB/Ir for spin-orbitronic devices

Abstract : Iridium is a very promising material for spintronic applications due to its interesting magnetic properties such as large Ruderman-Kittel-Kasuya-Yosida exchange coupling as well as its large spin-orbit coupling value. Ir is for instance used as a spacer layer for perpendicular synthetic antiferromagnetic or ferrimagnet systems. However, only a few studies of the spintronic parameters of this material have been reported. In this paper, we present inverse spin Hall effect-spin pumping ferromagnetic resonance measurements on CoFeB/Ir based bilayers to estimate the values of the effective spin Hall angle, the spin diffusion length within iridium, and the spin mixing conductance in the CoFeB/Ir bilayer. In order to have reliable results, we performed the same experiments on CoFeB/Pt bilayers, whose behavior is well known due to numerous reported studies. Our experimental results show that the spin diffusion length within iridium is 1.3 nm for resistivity of 250 n m, the spin mixing conductance g ↑↓ eff of the CoFeB/Ir interface is 30 nm −2 , and the spin Hall angle of iridium has the same sign as the one of platinum and is evaluated at 26% of the one of platinum. The value of the spin Hall angle found is 7.7% for Pt and 2% for Ir. These relevant parameters shall be useful to consider Ir in new concepts and devices combining spin-orbit torque and spin-transfer torque.
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Submitted on : Wednesday, November 11, 2020 - 12:03:41 PM
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T. Fache, J Rojas-Sánchez, L. Badie, S Mangin, S. Petit-Watelot. Determination of spin Hall angle, spin mixing conductance, and spin diffusion length in CoFeB/Ir for spin-orbitronic devices. Physical Review B, American Physical Society, 2020, 102, ⟨10.1103/physrevb.102.064425⟩. ⟨hal-02999938⟩

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