The basic model of spin-transfer torque (STT) in antiferromagnetic spintronics considers the exchange of angular momentum between quantum spins of flowing electrons and noncollinear-to-them localized spins treated as classical vectors. The results could be used towards designing a multi-bit-per-cell STT-based random access memory with an improved storage density. Higher harmonics are also observed, presumably due to spin-wave wells caused by the regions of spatially non-uniform effective magnetic field. At low currents, the asymmetry of polarization direction and that of the arms are observed to cause a splitting of the excited frequency modes. We compute spatially averaged frequency-domain spectrum of the time-domain magnetization dynamics in the presence of more ยป the current-induced STT term. Here, we employ the micromagnetic spectral mapping technique in an attempt to understand how the asymmetry of cross dimensions and spin polarization direction of the injected current affect the magnetization dynamics. STT switching showed different regions with increasing current density. In that structure, the free layer is designed to have four stable energy states using the shape anisotropy of a cross. We studied spin-transfer-torque (STT) switching of a cross-shaped magnetic tunnel junction in a recent report.
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