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
Abstract 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.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1403302) and the National Natural Science Foundation of China (Grant Nos. 52031015, U22A20115, and 12104030), the Natural Science Foundation of Zhejiang Province, China (Grant No. LZ25A040007), and the Natural Science Foundation of Beijing (Grant No. 1252026).
Wei Zhang(张伟), Wei He(何为), Qin-Li Lv(吕琴丽), Jian-Wang Cai(蔡建旺), Xiang-Qun Zhang(张向群), and Zhao-Hua Cheng(成昭华) Direct observation of ultrafast magnetization dynamics in Co/Ni bit patterned media by time-resolved scanning Kerr microscopy 2025 Chin. Phys. B 34 047501
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