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Ferromagnetic and Spin-Wave Resonance on Heavy-Metal-Doped Permalloy Films: Temperature Effects

Journal article
Authors Y. L. Yin
Martina Ahlberg
Philipp Dürrenfeld
Y. Zhai
Randy K. Dumas
Johan Åkerman
Published in Ieee Magnetics Letters
Volume 8
ISSN 1949-307X
Publication year 2017
Published at Department of Physics (GU)
Language en
Keywords Magnetodynamics, ferromagnetic resonance, spin wave stiffness, damping, magnetization, dependence, Engineering, Physics
Subject categories Physical Sciences


Broadband ferromagnetic resonance (FMR)spectroscopy is used to study the temperature (T)and dopantconcentration dependence of the magnetodynamic properties of Permalloy (Py = Ni80Fe20)and Py-100- M-x(x) films, where the dopant M = Pt, Au, and Ag. The saturation magnetization (MS)and Gilbert damping constant (a)are determined from the uniform FMR mode, while the spin wave stiffness (D)is extracted using the first perpendicular standing spinwave mode. The temperature dependence of D is best described by a T (2) law, which suggests a noticeable effect of the itinerant character of the electrons. The spin wave stiffness is also estimated using Bloch's law and the two methods are compared. The results strongly imply that not only spin wave and Stoner excitations, but also other mechanisms contribute to the reduction of MS. The damping increases with T for all samples, but the enhancement is most pronounced for Py doped with 30 at.% Au.

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