Scaling of spin Hall angle in 3d, 4d and 5d metals from Y3Fe5O12/metal spin pumping

Abstract

Pure spin currents generated by spin pumping in ferromagnet/nonmagnet (FM/NM) bilayers produce inverse spin Hall effect (ISHE) voltages in the NM, from which spin pumping and transport characteristics of the NM can be extracted. Due to its exceptionally low damping, Y3Fe5O12 (YIG) is an important and widely used FM for microwave devices and ferromagnetic resonance (FMR) spin pumping. Here we report systematic investigation of spin pumping from 20-nm thick YIG thin films to a series of 3d, 4d and 5d normal metals (Cu, Ag, Ta, W, Pt and Au) with various spin-orbit coupling strengths. From enhanced Gilbert damping obtained from the frequency dependence of FMR linewidths and ISHE signals, the spin Hall angles and YIG/NM interfacial spin mixing conductances are quantitatively determined for these metals. The spin Hall angles largely vary as the fourth power of the atomic number, corroborating the dominant role of spin-orbit coupling across a broad range in the inverse spin Hall effect.

16 pages 4 figures

References in corpus (5)

• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Large Spin Pumping from Epitaxial Y3Fe5O12 Thin Films to Pt and W Layers
• Probing the Spin Pumping Mechanism: Exchange Coupling with Exponential Decay in Y3Fe5O12/barrier/Pt Heterostructures

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