Field-free approaches for deterministic spin–orbit torque switching of the perpendicular magnet  

作　　者：Hao Wu Jing Zhang Baoshan Cui Seyed Armin Razavi Xiaoyu Che Quanjun Pan Di Wu Guoqiang Yu Xiufeng Han Kang L Wang 

机构地区：[1]Songshan Lake Materials Laboratory,Dongguan,Guangdong 523808,People’s Republic of China [2]Department of Electrical and Computer Engineering,and Department of Physics and Astronomy,University of California,Los Angeles,CA 90095,United States of America [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,People’s Republic of China

出　　处：《Materials Futures》2022年第2期51-63,共13页材料展望（英文）

基　　金：This work was supported by start-up funding support from Songshan Lake Materials Laboratory(Y1D1071S511);NSF Award Nos.1935362,1909416,1810163 and 1611570,the U.S.Army Research Office MURI program under Grant Nos.W911NF-16-1-0472;WN911NF-20-2-0166,and the National Key Technologies R&D Program of China(Nos.2016YFA0201102 and 2017YFA0206200).

摘　　要：All-electrical driven magnetization switching attracts much attention in next-generation spintronic memory and logic devices,particularly in magnetic random-access memory(MRAM)based on the spin–orbit torque(SOT),i.e.SOT-MRAM,due to its advantages of low power consumption,fast write/read speed,and improved endurance,etc.For conventional SOT-driven switching of the magnet with perpendicular magnetic anisotropy,an external assisted magnetic field is necessary to break the inversion symmetry of the magnet,which not only induces the additional power consumption but also makes the circuit more complicated.Over the last decade,significant effort has been devoted to field-free magnetization manipulation by using SOT.In this review,we introduce the basic concepts of SOT.After that,we mainly focus on several approaches to realize the field-free deterministic SOT switching of the perpendicular magnet.The mechanisms mainly include mirror symmetry breaking,chiral symmetry breaking,exchange bias,and interlayer exchange coupling.Furthermore,we show the recent progress in the study of SOT with unconventional origin and symmetry.The final section is devoted to the industrial-level approach for potential applications of field-free SOT switching in SOT-MRAM technology.

关 键 词：spin-orbit torque perpendicular magnetic anisotropy field-free switching symmetry breaking magnetic memory 

分 类 号：O62[理学—有机化学]