  In contrast with rich investigations about the translation of an
antiferromagnetic (AFM) texture, spin precession in an AFM texture is seldom
concerned for lacking an effective driving method. In this work, however, we
show that under an alternating spin-polarized current with spin along the AFM
anisotropy axis, spin precession can be excited in an AFM DW. Especially,
chaotic spin precession occurs at moderate interfacial Dzyaloshinskii-Moriya
interaction (DMI), which contributes to a nonlinear term in the dynamic
equation of DW precession. Also, crisis-induced intermittent chaos appears when
the current density is higher than a critical value. This work not only paves a
way to unravel rich spin precession behaviors in an AFM texture but also
provides guidelines for developing ultrafast spintronic devices based on new
physical principles.
