Vector spectroscopy for spin pumping

Abstract

We propose a method to separate the inverse spin Hall effect (ISHE) from galvanomagnetic effects in spin pumping experiments on metallic bilayer systems by measuring the dc electromotive force in two orthogonal directions. Calculations of dc voltages in longitudinal and Hall directions induced in Ni81Fe19 and Ni81Fe19/Pt films at ferromagnetic resonance in a microwave cavity predict that contributions from ISHE and from the galvanomagnetic effects, i.e. the anisotropic magnetoresistance and the anomalous Hall effect, exhibit distinct signal symmetry as well as angular dependence when changing the direction of the external field with respect to the film plane. According to measurements on Ni81Fe19/Pt, only that dc voltage component which includes ISHE is more than five times larger than purely galvanomagnetic components. This is corroborated by results on La0.67Sr0.33MnO3/Pt samples, demonstrating universality of this method.

17 pages, 6 figures

References in corpus (3)

• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Microwave photovoltage and photoresistance effects in ferromagnetic microstrips
• Magnonic Charge Pumping via Spin-Orbit Coupling

Cited by in corpus (7)

• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Large spin current generation by the spin Hall effect in mixed crystalline phase Ta thin films
• Transverse and Longitudinal Spin-Torque Ferromagnetic Resonance for Improved Measurements of Spin-Orbit Torques
• Efficient intrinsic spin-to-charge current conversion in an all-epitaxial single-crystal perovskite-oxide heterostructure of La0.67Sr0.33MnO3/LaAlO3/SrTiO3
• Large spin-to-charge conversion at the two-dimensional interface of transition metal dichalcogenides and permalloy
• Rashba semiconductor as spin Hall material: Experimental demonstration of spin pumping in wurtzite $n$-GaN:Si
• Probing the Spin-Momentum Locking in Rashba Surfaces via Spin Current