Abstract
We measure the compositional dependence of ferromagnetic relaxation (damping) in (Ni81Fe19)1−xCux magnetic thin films. The compositions tested (0⩽x⩽0.30) cover the decreasing, high-Z (27.6⩽Z⩽28.0) branch of the Slater-Pauling curve. Broadband (0–18GHz) ferromagnetic resonance measurements in parallel (in-plane) and perpendicular (out-of-plane) resonance configurations reveal purely intrinsic, Gilbert-type damping, increasing with Cu content, from α=0.0081±0.0003 (no Cu) to α=0.0242±0.0006 (30% Cu). Despite the marked decrease in saturation magnetization μ0Ms, in good agreement with Slater-Pauling values, the relaxation rate G also increases, from G=112±4MHz (no Cu) to G=150±4MHz (30% Cu). The results are similar in variation with Z to those found on the low-Z branch of the Slater-Pauling curve, in epitaxial Fe1−xVx.
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