Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance
D. A. Arena (1), E. Vescovo (1), C.-C. Kao (1), Y. Guan (2), W. E., Bailey (2) ((1) National Synchrotron Light Source, Brookhaven National Lab,, Upton, NY, (2) Materials Science Program, Department of Applied Physics,, Columbia University, New York, NY)
TL;DR
This study uses advanced time-resolved x-ray magnetic circular dichroism to measure layer-specific ferromagnetic resonance in a multilayer structure, revealing weak interlayer coupling through phase and amplitude analysis.
Contribution
It introduces a novel layer- and time-resolved FMR measurement technique capable of detecting weak interlayer coupling via phase and amplitude analysis.
Findings
Layer-specific precession observed in Ni, Fe, and Co.
Weak ferromagnetic coupling detected through phase lag analysis.
Resonance behavior characterized at 2.3 GHz.
Abstract
We demonstrate a layer- and time-resolved measurement of ferromagnetic resonance (FMR) in a Ni81Fe19 / Cu / Co93Zr7 trilayer structure. Time-resolved x-ray magnetic circular dichroism has been developed in transmission, with resonant field excitation at a FMR frequency of 2.3 GHz. Small-angle (to 0.2 degree), time-domain magnetization precession could be observed directly, and resolved to individual layers through elemental contrast at Ni, Fe, and Co edges. The phase sensitivity allowed direct measurement of relative phase lags in the precession oscillations of individual elements and layers. A weak ferromagnetic coupling, difficult to ascertain in conventional FMR measurements, is revealed in the phase and amplitude response of individual layers across resonance.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.