In this paper it is demonstrated micromagnetically the possibility to have high frequency and high power microwave emission at zero field in magnetic tunnel junctions with an off-centered vortex polarizer for current densities smaller than 10(7) A/cm(2). We found power spectra characterized by two harmonics (around 6 GHz and 12 GHz) where the second one has the larger power. Due to the non-uniform configuration of the polarizer, the effect of the perpendicular torque is partially compensated by the Oersted field. Our predictions give rise to the design of a more compact and easily embedded spin-torque oscillators for all-on-chip applications
High frequency spin-torque-oscillators with reduced perpendicular torque effect based on asymmetric vortex polarizer / Carpentieri, Mario; E., Martinez; G., Finocchio. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 110:9(2011). [10.1063/1.3657844]
High frequency spin-torque-oscillators with reduced perpendicular torque effect based on asymmetric vortex polarizer
CARPENTIERI, Mario;
2011-01-01
Abstract
In this paper it is demonstrated micromagnetically the possibility to have high frequency and high power microwave emission at zero field in magnetic tunnel junctions with an off-centered vortex polarizer for current densities smaller than 10(7) A/cm(2). We found power spectra characterized by two harmonics (around 6 GHz and 12 GHz) where the second one has the larger power. Due to the non-uniform configuration of the polarizer, the effect of the perpendicular torque is partially compensated by the Oersted field. Our predictions give rise to the design of a more compact and easily embedded spin-torque oscillators for all-on-chip applicationsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
