Inductive detection of fieldlike and dampinglike ac inverse spin-orbit torques in ferromagnet/normal-metal bilayers
Berger AJ, Edwards ERJ, Nembach HT, Karenowska AD, Weiler M, Silva TJ (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 97
Article Number: 094407
Journal Issue: 9
DOI: 10.1103/PhysRevB.97.094407
Abstract
Functional spintronic devices rely on spin-charge interconversion effects, such as the reciprocal processes of electric field-driven spin torque and magnetization dynamics-driven spin and charge flow. Both dampinglike and fieldlike spin-orbit torques have been observed in the forward process of current-driven spin torque and dampinglike inverse spin-orbit torque has been well studied via spin pumping into heavy metal layers. Here, we demonstrate that established microwave transmission spectroscopy of ferromagnet/normal metal bilayers under ferromagnetic resonance can be used to inductively detect the ac charge currents driven by the inverse spin-charge conversion processes. This technique relies on vector network analyzer ferromagnetic resonance (VNA-FMR) measurements. We show that in addition to the commonly extracted spectroscopic information, VNA-FMR measurements can be used to quantify the magnitude and phase of all ac charge currents in the sample, including those due to spin pumping and spin-charge conversion. Our findings reveal that Ni80Fe20/Pt bilayers exhibit both dampinglike and fieldlike inverse spin-orbit torques. While the magnitudes of both the dampinglike and fieldlike inverse spin-orbit torque are of comparable scale to prior reported values for similar material systems, we observed a significant dependence of the dampinglike magnitude on the order of deposition. This suggests interface quality plays an important role in the overall strength of the dampinglike spin-to-charge conversion.
Involved external institutions
National Institute of Standards and Technology (NIST)
United States (USA) (US)
University of Oxford
United Kingdom (GB)
Bayerische Akademie der Wissenschaften
Germany (DE)
United States (USA) (US)
University of Oxford
United Kingdom (GB)
Bayerische Akademie der Wissenschaften
Germany (DE)
How to cite
APA:
Berger, A.J., Edwards, E.R.J., Nembach, H.T., Karenowska, A.D., Weiler, M., & Silva, T.J. (2018). Inductive detection of fieldlike and dampinglike ac inverse spin-orbit torques in ferromagnet/normal-metal bilayers. Physical Review B, 97(9). https://doi.org/10.1103/PhysRevB.97.094407
MLA:
Berger, Andrew J., et al. "Inductive detection of fieldlike and dampinglike ac inverse spin-orbit torques in ferromagnet/normal-metal bilayers." Physical Review B 97.9 (2018).
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