A beta-Ta system for current induced magnetic switching in the absence of external magnetic field

作者：Chen Wenzhe; Qian Lijuan; Xiao Gang^*

来源：AIP Advances, 2018, 8(5): 055918.

DOI：10.1063/1.5008512

Magnetic switching via Giant Spin Hall Effect (GSHE) has received great interest for its role in developing future spintronics logic or memory devices. In this work, a new material system (i.e. a transition metal sandwiched between two ferromagnetic layers) with interlayer exchange coupling is introduced to realize the deterministic field-free perpendicular magnetic switching. This system uses beta-Ta, as the GSHE agent to generate a spin current and as the interlayer exchange coupling medium to generate an internal field. The critical switching current density at zero field is on the order of 10(6) A/cm(2) due to the large spin Hall angle of beta-Ta. The internal field, along with switching efficiency, depends strongly on the orthogonal magnetization states of two ferromagnetic coupling layers in this system.

• 出版日期2018-5