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Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales

Abstract : We present a two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer system, a spin-valve nanopillar with perpendicular magnetic anisotropy. Two pulses separated by a short delay (<500 ps) are shown to lead to the same switching probability as a single pulse with a duration that depends on the delay. This demonstrates a remarkable symmetry between magnetic excitation and relaxation and provides a direct measurement of the magnetic relaxation time. The results are consistent with a simple finite-temperature Fokker-Planck macrospin model of the dynamics, suggesting more coherent magnetization dynamics in this short-time nonequilibrium limit than near equilibrium.
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H. Liu, D. Bedau, J. Z Sun, S. Mangin, E. E. Fullerton, et al.. Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85 (22), pp.220405. ⟨10.1103/PhysRevB.85.220405⟩. ⟨hal-02085994⟩



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