Authors: Man Yang, Liang Sun, Yulun Zeng, Jun Cheng, Kang He, Xi Yang, Ziqiang Wang, Longqian Yu, Heng Niu, Tongzhou Ji, Gong Chen, Bingfeng Miao, Xiangrong Wang, Haifeng Ding
Published: 2024-04-13
DOI: 10.1038/s41467-024-47577-x
Source: Full article
AbstractYttrium iron garnet, a material possessing ultralow magnetic damping and extraordinarily long magnon diffusion length, is the most widely studied magnetic insulator in spintronics and magnonics. Field-free electrical control of perpendicular yttrium iron garnet magnetization with considerable efficiency is highly desired for excellent device performance. Here, we demonstrate such an accomplishment with a collinear spin current, whose spin polarization and propagation direction are both perpendicular to the interface. Remarkably, the field-free magnetization switching is achieved not only with a heavy-metal-free material, Permalloy, but also with a higher efficiency as compared with a typical heavy metal, Pt. Combined with the direct and inverse effect measurements, we ascribe the collinear spin current to the anomalous spin Hall effect in Permalloy. Our findings provide a new insight into spin current generation in Permalloy and open an avenue in spintronic devices.