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Relaxation mechanism in NiFe thin films driven by spin angular momentum absorption throughout the antiferromagnetic phase transition in native surface oxides

Abstract : We report an alternative mechanism for the physical origin of the temperature-dependent ferromagnetic relaxation of Permalloy (NiFe) thin films. Through spin-pumping experiments, we demonstrate that the peak in the temperature-dependence of NiFe damping can be understood in terms of enhanced spin angular momentum absorption at the magnetic phase transition in antiferromagnetic surface-oxidized layers. These results suggest new avenues for the investigation of an incompletely-understood phenomenon in physics.
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L. Frangou, G. Forestier, S. Auffret, S. Gambarelli, V. Baltz. Relaxation mechanism in NiFe thin films driven by spin angular momentum absorption throughout the antiferromagnetic phase transition in native surface oxides. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 95, pp.054416. ⟨10.1103/PhysRevB.95.054416⟩. ⟨hal-01568743v2⟩

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