Abstract
Spin-orbit-related effects offer a highly promising route for reading and writing information in magnetic units of future devices. These phenomena rely not only on the static magnetization orientation but also on its dynamics to achieve fast switchings that can reach the THz range. In this work, we consider Co/Pt and Fe/W bilayers to show that accounting for the phase difference between different processes is crucial to the correct description of the dynamical currents. By tuning each system towards its ferromagnetic resonance, we reveal that dynamical spin Hall angles can non-trivially change sign and be boosted by over 500%, reaching giant values. We demonstrate that charge and spin pumping mechanisms can greatly magnify or dwindle the currents flowing through the system, influencing all kinds of magnetoresistive and Hall effects, thus impacting also dc and second harmonic experimental measurements.
Highlights
The interrelation between magnetic properties and electric currents has been studied for more than a century[1, 2]
The measurements are usually described by simple functional forms[2, 25], and the characteristics of the magnetization dynamics are studied within a semi-classical approach
We investigate the intrinsic feedback of the current-induced magnetization dynamics to the electric current that drives it
Summary
The interrelation between magnetic properties and electric currents has been studied for more than a century[1, 2]. The effective magnetic fields that drive the magnetization into precession in those systems are obtained experimentally through second order signals, either dc (rectified)[9, 16, 22] or doubled-frequency (second-harmonic) voltages[17, 23, 24] These measurements depend both on the transverse magnetization components, and on the magnetoresistance (or Hall resistance). In the systems we have considered, we further show that magnetic excitations are the main source — but not the only one — of the dynamic contributions They can be manipulated by varying the frequency and intensity of the applied fields, which can affect second order signals measured in experiments. This change in current signals provides an efficient way of manipulating magnetic states and establish a powerful ingredient for the development of spintronic devices
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
