Direct observation of ultrafast magnetization dynamics in Co/Ni bit patterned media by time-resolved scanning Kerr microscopy  

作　　者：Wei Zhang Wei He Qin-Li Lv Jian-Wang Cai Xiang-Qun Zhang Zhao-Hua Cheng 张伟;何为;吕琴丽;蔡建旺;张向群;成昭华

机构地区：[1]State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]National Key Laboratory of Spintronics,Hangzhou International Innovation Institute,Beihang University,Hangzhou 311115,China [3]Guobiao(Beijing)Testing&Certification Co.,Ltd.,China Grinm Group Co.,Ltd.,Beijing 101407,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2025年第4期579-583,共5页中国物理B(英文版)

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2022YFA1403302);the National Natural Science Foundation of China(Grant Nos.52031015,U22A20115,and 12104030);the Natural Science Foundation of Zhejiang Province,China(Grant No.LZ25A040007);the Natural Science Foundation of Beijing(Grant No.1252026).

摘　　要：Bit patterned recording(BPR)has attracted much attention due to its promising potential in achieving high densities in magnetic storage devices.The materials with strong perpendicular magnetic anisotropy(PMA)are always preferred in designing the BPR.Here,the patterned Co/Ni multilayers showing d-d hybridization induced PMA was studied.In particular,we record the ultrafast spin dynamics by means of time-resolved scanning magneto-optical Kerr effect(TRMOKE)microscopy.We are able to acquire the“snapshot”magnetic maps of the sample surface because of both the femtosecond temporal and submicrometer spatial resolution in our TRMOKE microscopy.Furthermore,the spatially inhomogeneous ultrafast demagnetization was observed in experiment,and this has been evidenced by simulations.

关 键 词：ultrafast spin dynamics magneto-optical Kerr effect micromagnetic simulations 

分 类 号：O469[理学—凝聚态物理]