Observation of magnetic droplets in magnetic tunnel junctions  

作　　者：Kewen Shi Wenlong Cai Sheng Jiang Daoqian Zhu Kaihua Cao Zongxia Guo Jiaqi Wei Ao Du Zhi Li Yan Huang Jialiang Yin Johan Akerman Weisheng Zhao 

机构地区：[1]Fert Beijing Institute,M1IT Key Laboratory of Spintronics,School of Integrated Circuit Science and Engineering,Beihang University,Beijing 100191,China [2]Beihang-Goertek Joint Microelectronics Institute,Qingdao Research Institute,Beihang University,Qingdao 266000,China [3]Department of Physics,University of Gothenburg,Gothenburg 41296,Sweden [4]Department of Applied Physics,School of Engineering Sciences.KTH Royal Institute of Technology,Kista 16440,Sweden [5]School of Microelectronics,Northwestern Poly technical University,Xi'an 710072,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2022年第2期99-105,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Beijing Municipal Science and Technology Project(Grant No.Z201100004220002);the National Natural Science Foundation of China(Grant Nos.61627813,61904009);the China Postdoctoral Science Foundation Funded Project(Grant No.2018M641151)。

摘　　要：Magnetic droplets,a class of highly nonlinear magnetodynamic solitons,can be nucleated and stabilized in nanocontact spintorque nano-oscillators.Here we experimentally demonstrate magnetic droplets in magnetic tunnel junctions(MTJs).The droplet nucleation is accompanied by power enhancement compared with its ferromagnetic resonance modes.The nucleation and stabilization of droplets are ascribed to the double-Co Fe B free-layer structure in the all-perpendicular MTJ,which provides a low Zhang-Li torque and a high pinning field.Our results enable better electrical sensitivity in fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications and materials science.

关 键 词：spin-torque nano-oscillators magnetic droplets spin dynamics magnetic tunnel junctions 

分 类 号：O469[理学—凝聚态物理]