Parameter dependence of resonant spin torque magnetization reversal

Abstract

We numerically study ultra fast resonant spin torque (ST) magnetization reversal in magnetic tunnelling junctions (MTJ) driven by current pulses having a direct current (DC) and a resonant alternating current (AC) component. The precessional ST dynamics of the single domain MTJ free layer cell are modelled in the macro spin approximation. The energy efficiency, reversal time, and reversal reliability are investigated under variation of pulse parameters like direct and AC current amplitude, AC frequency and AC phase. We find a range of AC and direct current amplitudes where robust resonant ST reversal is obtained with faster switching time and reduced energy consumption per pulse compared to purely direct current ST reversal. However for a certain range of AC and direct current amplitudes a strong dependence of the reversal properties on AC frequency and phase is found. Such regions of unreliable reversal must be avoided for ST memory applications.

17 pages, 4 figures

References in corpus (6)

• Measurement of the Spin-Transfer-Torque Vector in Magnetic Tunnel Junctions
• Observation of spin-transfer switching in deep submicron-sized and low-resistance magnetic tunnel junctions
• Resonant Spin-Transfer-Driven Switching of Magnetic Devices Assisted by Microwave Current Pulses
• Biased quasi ballistic spin torque magnetization reversal
• Switching spin valves using r.f. currents
• Effects of rf Current on Spin Transfer Torque Induced Dynamics

Cited by in corpus (3)

• Coercivity reduction in a two-dimensional array of nanoparticles
• Optimization of spin-torque switching using AC and DC pulses
• Spin-transfer torque effects in the dynamic forced response of the magnetization of nanoscale ferromagnets in superimposed ac and dc bias fields in the presence of thermal agitation