Controllable field-free switching of perpendicular magnetization through bulk spin-orbit torque in symmetry-broken ferromagnetic films oleh Xuejie Xie, Xiaonan Zhao, Yanan Dong, Xianlin Qu, Kun Zheng, Xiaodong Han, Xiang Han, Yibo Fan, Lihui Bai, Yanxue Chen, Youyong Dai, Yufeng Tian, Shishen Yan