Asymmetric angular dependence of spin-transfer torques in CoFe/Mg-B-O/CoFe magnetic tunnel junctions

作者：Tang, Ling^*; Xu, Zhi-Jun^*; Zuo, Xian-Jun; Yang, Ze-Jin^*; Gao, Qing-He; Linghu, Rong-Feng^*; Guo, Yun-Dong^*

来源：Journal of Applied Physics, 2016, 119(16): 163902.

DOI：10.1063/1.4947527

• MULTILAYERS
• DRIVEN
• PHASE

Using a first-principles noncollinear wave-function-matching method, we studied the spin-transfer torques (STTs) in CoFe/Mg-B-O/CoFe(001) magnetic tunnel junctions (MTJs), where three different types of B-doped MgO in the spacer are considered, including B atoms replacing Mg atoms (Mg3BO4), B atoms replacing O atoms (Mg3BO4), and B atoms occupying interstitial positions (Mg3BO4) in MgO. A strong asymmetric angular dependence of STT can be obtained both in ballistic CoFe/Mg3BO4 and CoFe/Mg3BO4 based MTJs, whereas a nearly symmetric STT curve is observed in the junctions based on CoFe/Mg3BO4. Furthermore, the asymmetry of the angular dependence of STT can be suppressed significantly by the disorder of B distribution. Such skewness of STTs in the CoFe/Mg-B-O/CoFe MTJs could be attributed to the interfacial resonance states induced by the B diffusion into MgO spacer. Published by AIP Publishing.

• 出版日期2016-4-28
• 单位东北大学; 浙江工业大学; 中国人民解放军信息工程大学; 辽宁中医药大学; 内江师范学院