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Article Dans Une Revue Communications Physics Année : 2021

Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

Alex. Jenkins
  • Fonction : Auteur
Lara San Emeterio Alvarez
  • Fonction : Auteur
Samh Memshawy
  • Fonction : Auteur
Paolo Bortolotti
  • Fonction : Auteur
Paulo Freitas
  • Fonction : Auteur
Ricardo Ferreira
  • Fonction : Auteur

Résumé

Abstract NiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

Dates et versions

hal-03334688 , version 1 (04-09-2021)

Identifiants

Citer

Alex. Jenkins, Lara San Emeterio Alvarez, Samh Memshawy, Paolo Bortolotti, Vincent Cros, et al.. Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions. Communications Physics, 2021, 4 (1), ⟨10.1038/s42005-021-00614-3⟩. ⟨hal-03334688⟩
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