Thickness-dependent magnetic properties in Pt/[Co/Ni]_(n) multilayers with perpendicular magnetic anisotropy  

作　　者：晏春杰 陈丽娜 周恺元 杨留鹏 付清为 王文强 岳文诚 梁力克 陶醉 杜军 王永磊 刘荣华 Chunjie Yan;Lina Chen;Kaiyuan Zhou;Liupeng Yang;Qingwei Fu;Wenqiang Wang;Wen-Cheng Yue;Like Liang;Zui Tao;Jun Du;Yong-Lei Wang;Ronghua Liu(National Laboratory of Solid State Microstructures,School of Physics and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;School of Electronics Science and Engineering,Nanjing University,Nanjing 210093,China)

机构地区：[1]National Laboratory of Solid State Microstructures,School of Physics and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [3]School of Electronics Science and Engineering,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics B》2023年第1期503-508,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.11774150,12074178,12004171,12074189,and 51971109);the Applied Basic Research Programs of Science and Technology Commission Foundation of Jiangsu Province,China (Grant No.BK20170627);the National Key Research and Development Program of China (Grant No.2018YFA0209002);the Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology;the Scientific Foundation of Nanjing University of Posts and Telecommunications (NUPTSF) (Grant No.NY220164)。

摘　　要：We systematically investigated the Ni and Co thickness-dependent perpendicular magnetic anisotropy(PMA)coefficient,magnetic domain structures,and magnetization dynamics of Pt(5 nm)/[Co(t_(Co))/Ni(t_(Ni))]_(5)/Pt(1 nm)multilayers by combining the four standard magnetic characterization techniques.The magnetic-related hysteresis loops obtained from the field-dependent magnetization M and anomalous Hall resistivity(AHR)ρxy showed that the two serial multilayers with t_(Co)=0.2 nm and 0.3 nm have the optimum PMA coefficient K_(U) as well as the highest coercivity H_(C) at the Ni thickness t_(Ni)=0.6 nm.Additionally,the magnetic domain structures obtained by magneto-optic Kerr effect(MOKE)microscopy also significantly depend on the thickness and K_(U) of the films.Furthermore,the thickness-dependent linewidth of ferromagnetic resonance is inversely proportional to K_(U) and H_(C),indicating that inhomogeneous magnetic properties dominate the linewidth.However,the intrinsic Gilbert damping constant determined by a linear fitting of the frequency-dependent linewidth does not depend on the Ni thickness and K_(U).Our results could help promote the PMA[Co/Ni]multilayer applications in various spintronic and spin-orbitronic devices.

关 键 词：perpendicular magnetic anisotropy magnetic domain DAMPING multiayers 

分 类 号：O469[理学—凝聚态物理]