Investigation of magnetization reversal and domain structures in perpendicular synthetic antiferromagnets by first-order reversal curves and magneto-optical Kerr effect  

作　　者：王向谦 李佳楠 何开宙 谢明玲 朱旭鹏 Xiang-Qian Wang;Jia-Nan Li;Kai-Zhou He;Ming-Ling Xie;Xu-Peng Zhu(School of Physics Science and Technology,Lingnan Normal University,Zhangjiang 524048,China;Key Laboratory of Sensor and Sensor Technology,Institute of Sensor Technology,Gansu Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]School of Physics Science and Technology,Lingnan Normal University,Zhangjiang 524048,China [2]Key Laboratory of Sensor and Sensor Technology,Institute of Sensor Technology,Gansu Academy of Sciences,Lanzhou 730000,China

出　　处：《Chinese Physics B》2023年第11期580-584,共5页中国物理B(英文版)

基　　金：Project supported by the Natural Science Foundation of Gansu Province, China (Grant No. 22JR5RA775);the Science and Technology Program of Lanzhou, China (Grant No. 2021-1-157);the Guangdong Basic and Applied Basic Research Foundation, China (Grant Nos. 2020A1515110998 and 2022A1515012123);the Outstanding Youth Foundation of Gansu Academy of Science, China (Grant No. 2021YQ01);the Innovative Team Construction Project of Gansu Academy of Sciences, China (Grant No. 2020CX005-01)。

摘　　要：Perpendicular synthetic-antiferromagnet(p-SAF) has broad applications in spin-transfer-torque magnetic random access memory and magnetic sensors. In this study, the p-SAF films consisting of (Co/Ni)3]/Ir(tIr)/[(Ni/Co)3are fabricated by magnetron sputtering technology. We study the domain structure and switching field distribution in p-SAF by changing the thickness of the infrared space layer. The strongest exchange coupling field(Hex) is observed when the thickness of Ir layer(tIr) is 0.7 nm and becoming weak according to the Ruderman–Kittel–Kasuya–Yosida-type coupling at 1.05 nm,2.1 nm, 4.55 nm, and 4.9 nm in sequence. Furthermore, the domain switching process between the upper Co/Ni stack and the bottom Co/Ni stack is different because of the antiferromagnet coupling. Compared with ferromagnet coupling films, the antiferromagnet samples possess three irreversible reversal regions in the first-order reversal curve distribution.With tIrincreasing, these irreversible reversal regions become denser and smaller. The results from this study will help us understand the details of the magnetization reversal process in the p-SAF.

关 键 词：perpendicular synthetic antiferromagnet first-order reversal curves magnetization reversal pro-cess DOMAIN 

分 类 号：O469[理学—凝聚态物理]