Simultaneous Optical and Electrical Spin-Torque Magnetometry with Phase-Sensitive Detection of Spin Precession

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

Research output: Contribution to journalArticlepeer-review

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. 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.

Original languageEnglish (US)
Article number034047
JournalPhysical Review Applied
Volume11
Issue number3
DOIs
StatePublished - Mar 19 2019
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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