[Paper] Numerical Study on Microwave based Read-write Operation in Magnetic Vortex Memory

Abstract

In the present study, feasibility of magnetic vortex core (VC) polarity as a binary information carrier has been investigated by micromagnetics simulations. Both of the read and write operation were carried out with current induced pulsed microwave fields, but different amplitude, generated with a pair of orthogonally overlaid conductors. Asymmetric resonance properties of the VC rotational motion against the circularly polarized microwave fields were converted to the inductive voltage. Overwrite of the VC polarization was also performed by utilizing the asymmetric VC switching property. Structural parameters for proposed device architecture were systematically optimized for efficient memory operation. Successive read (write) operation was demonstrated with pulsed alternative currents of 1.18 GHz frequency, 4.2 ns duration (5 periods) and 0.6 mA (1.2 mA) amplitude.