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Ferromagnetic/paramagnetic bilayer systems have been used to investigate inverse spin-Hall effect (ISHE) extensively with the technique of spin-pumping which is based on a mechanism driving the spin moment from ferromagnetic layers into paramagnetic layers via the ferromagnetic resonance procession. When the spin current is induced in the paramagnetic layer, a transversal electrical potential difference is generated and can be measured. Among many, platinum is the most effective paramagnetic metal with a strong inverse spin-Hall effect due to its strong spin-orbit coupling. In this work, we study ISHE in two kinds of bilayer films, Ni81Fe19(Py)/Pt and La0.7Sr0.3MnO3(LSMO)/Pt. Our experimental results show that the voltage induced by ISHE in LSMO/Pt ( ~ 1.0 μV) is one order smaller than that Py/Pt ( ~ 10 μV) at 100 mW of microwave power, despite the fact that LSMO has much higher spin polarization than Py. Based on our fitting results, the reason for the reduction of spin-pumping effect in LSMO/Pt may be the strong anomalous Hall Effect in LSMO.
Date of Publication: Nov. 2012