Macrospin study on magnetization reversal in synthetic antiferromagnetically coupled composite of perpendicularly magnetized nanomagnets

Magnetization reversal in a synthetic antiferromagnetically coupled composite of perpendicularly magnetized nanomagnets is theoretically explored based on the macrospin model. The analytical expressions of magnetization reversal are derived. The analytical results are confirmed by the results of the Landau–Lifshitz–Gilbert simulation. Furthermore, we find that a critical antiferromagnetic coupling constant exists at which the dynamics of magnetization reversal changes, and we obtain its analytical expression. This report provides a fundamental analysis insight into antiferromagnetic spintronic phenomena suitable for applications in ultra-high speed devices and nonvolatile memory technologies, for example, state-of-the-art voltage-controlled magnetoresistive random access memory.