• Bidthanapally, Rao
• Zhang, Zhizhi
• Xiong, Yuzan
• Qu, Hongwei
• Srinivasan, Gopalan
• Novosad, Valentine
• Hoffmann, Axel
• Pearson, John E.
• Zhang, Wei
• Saglam, Hilal
• Li, Yi

Abstract

Spin-based coherent information processing and encoding utilize the precession phase of spins in magnetic materials. However, the detection and manipulation of spin precession phases remain a major challenge for advanced spintronic functionalities. By using simultaneous electrical and optical detection, we demonstrate the direct measurement of the spin precession phase of a permalloy device driven by the spin-orbit torques from adjacent heavy metals. The spin Hall angle of the heavy metals can be independently determined from concurrent electrical and optical signals. The phase-sensitive optical detection also allows spatially-resolved measurements of local spin-torque parameters and ferromagnetic resonance with comprehensive amplitude and phase information. Here, our study offers a route toward future advanced characterizations of spin-torque oscillators, magnonic circuits, and tunneling junctions, where measuring the current-induced spin dynamics of individual nanomagnets is required.

Topics

• impedance spectroscopy
• phase