Tianli Jin, Yuliang Zhu, Shaomin Li, Bo Zhang, Funan Tan, Gerard Joseph Lim, Jiangwei Cao, Kaiming Cai, Wen Siang Lew. "Generation of high and bidirectional out-of-plane spin–orbit torque through vertical magnetization gradient." Applied Physics Letters, 2025. doi:10.1063/5.0251658