Study on manipulating skyrmion dynamics by surface acoustic waves

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Antiferromagnets (AFMs) have the natural advantages of terahertz spin dynamics and negligible stray fields, thus appealing for domain-wall applications. However, it has been challenging due to their insensitive magneto-electric responses. Recent research on noncollinear chiral AFMs Mn3Sn/Ge enabled us to detect and manipulate their magnetic octupole domain states. This year, I have demonstrated a current-driven fast magnetic octupole domain-wall (MODW) motion in Mn3Sn/Ge. The magneto-optical Kerr observation reveals the Neel-like MODW of Mn3Ge can be accelerated up to 750 m s-1 with a current density of only 7.56 MA cm-2 under no magnetic field.