Journal
PHYSICAL REVIEW B
Volume 102, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.064425
Keywords
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Funding
- ANRT
- Vinci Technologies [2016/1458]
- Agence Nationale de la Recherche (France) [ANR-18-CE24-0008, ANR-19CE24-0016-01]
- French PIA project Lorraine Universite d'Excellence [ANR15IDEX-04-LUE]
- Region Grand Est, Metropole du Grand Nancy, Institut Carnot ICEEL
- FEDER-FSE Lorraine et Massif Vosges 2014-2020, a European Union Program
- FEDER
- Grand Est Region through the RaNGE project
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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 Omega m, the spin mixing conductance g(eff)(up arrow down arrow) 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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