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Surface acoustic waves (SAWs) have emerged as innovative and energy-efficient means to manipulate domain walls (DWs) and skyrmions in thin films with perpendicular magnetic anisotropy (PMA) owing to the magnetoelastic coupling effect. This thesis focuses on the complex interplay between SAWs and magnetic thin films. The effects of the standing SAWs on the magnetisation dynamics in a Ta/Pt/Co/Ir/Ta thin film with PMA were first investigated. SAWs with frequency of 93.35 MHz significantly reduced the coercivity of the thin film by 21% and enhanced the magnetisation reversal speed by 11-fold. Standing SAWs introduce a dynamic energy landscape with a unique spatial distribution, forming striped domain patterns in the thin film. The use of rf signals for generating SAWs inevitably causes a heating effect in the device. This heating effect was examined in situ in a SAW device featuring a Ta/Pt/Co/Ta thin film with PMA using an on-chip platinum thermometer. The temperature increased by 10 K in the presence of SAWs at centre frequency of 48 MHz. The DW velocity was significantly enhanced in the presence of the standing SAWs by a factor of 4 compared to that with temperature change alone ow

Author

Shuai, Jintao

Published

2023

Language

EN