Optimizing spin pumping in Yttrium Iron Garnet/Platinum bilayers under varying oxygen pressure

Here, we study the influence of magnetic properties on the spin-pumping effect of the Yttrium Iron Garnet/Platinum (YIG/Pt) bilayer. YIG films were deposited by pulsed laser deposition under variable oxygen pressures. Using broadband ferromagnetic resonance techniques, the magnetic properties of the YIG films were measured. We analyzed the spin-pumping effect in these films by measuring damping changes in samples with and without Pt layers, enabling the calculation of spin-mixing conductance. Experimental results show that films prepared at high oxygen pressure exhibit lower magnetization and reduced spin pumping, asp, sp , leading to a decreased spin mixing conductance, gt t . We report a variation in gt t ranging from 4.2x1018 . 2x10 18 to 15.6x1018, . 6x10 18 , m-2. -2 . These findings underscore the sensitivity of spin transport properties to deposition parameters in YIG-based spintronic devices.