Optimization of spin-torque switching using AC and DC pulses

TL;DR

This paper investigates how to optimize spin-torque induced magnetic switching in magnetic tunnel junctions by combining AC and DC pulses, aiming to minimize heat loss and improve switching efficiency.

Contribution

It introduces a method to optimize pulse parameters and frequency for magnetic reversal, considering combined AC and DC spin-currents, and compares results with numerical simulations.

Findings

Optimal pulse times and currents are identified.

Different dynamic regimes are revealed for switching.

Optimization reduces Joule heat during switching.

Abstract

We explore spin-torque induced magnetic reversal in magnetic tunnel junctions using combined AC and DC spin-current pulses. We calculate the optimal pulse times and current strengths for both AC and DC pulses as well as the optimal AC signal frequency, needed to minimize the Joule heat lost during the switching process. The results of this optimization are compared against numeric simulations. Finally we show how this optimization leads to different dynamic regimes, where switching is optimized by either a purely AC or DC spin-current, or a combination AC/DC spin-current, depending on the anisotropy energies and the spin-current polarization.