Fig. 2: Trilayer-based structure and spin-torque ferromagnetic resonance.
From: Giant charge-to-spin conversion in ferromagnet via spin-orbit coupling
a Schematic of multilayer stacks (left) and setup of ST-FMR measurement (right). b Resonance spectra of +MPML and −MPML states (red and blue data, respectively). μ0 is vacuum permeability. Solid curves show fitting curve using Eq. (3). c Dependence of modulated Gilbert damping coefficient Δα on applied bias current IDC under +MPML (red) and −MPML states (blue). Left and right graphs show measurement under φ = 135° and 30°, respectively. Solid lines show linear fitting results. d Angular dependence of damping modulation efficiency Δα/IDC and ±MPML state (red and blue data, respectively). Solid curves show fitting results using Eq. (2).
