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High frequency voltage-induced ferromagnetic resonance in magnetic tunnel junctions

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arxiv 1906.01301 v1 pith:MTEZXP7H submitted 2019-06-04 physics.app-ph cond-mat.mtrl-sci

classification physics.app-phcond-mat.mtrl-sci
keywords magneticv-fmrbufferdampingdifferentenergyferromagneticjunctions
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Voltage-induced ferromagnetic resonance (V-FMR) in magnetic tunnel junctions (MTJs) with a W buffer is investigated. Perpendicular magnetic anisotropy (PMA) energy is controlled by both thickness of a CoFeB free layer deposited directly on the W buffer and a post-annealing process at different temperatures. The PMA energy as well as the magnetization damping are determined by analysing field-dependent FMR signals in different field geometries. An optimized MTJ structure enabled excitation of V-FMR at frequencies exceeding 30 GHz. The macrospin modelling is used to analyse the field- and angular-dependence of the V-FMR signal and to support experimental magnetization damping extraction.

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