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Ultrafast Orbital‐Oriented Control of Magnetization in Half‐Metallic La 0.7 Sr 0.3 MnO 3 Films
Author(s) -
Liu Bo,
Niu Wei,
Chen Yongda,
Ruan Xuezhong,
Tang Zhixiong,
Wang Xuefeng,
Liu Wenqing,
He Liang,
Li Yao,
Wu Jing,
Tang Shaolong,
Du Jun,
Zhang Rong,
Xu Yongbing
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201806443
Subject(s) - spintronics , condensed matter physics , magnetization dynamics , magnetization , materials science , ultrashort pulse , anisotropy , picosecond , demagnetizing field , spins , spin–orbit interaction , coupling (piping) , magnetic anisotropy , spin (aerodynamics) , ferromagnetism , physics , laser , optics , magnetic field , quantum mechanics , metallurgy , thermodynamics
Manipulating spins by ultrafast pulse laser provides a new avenue to switch the magnetization for spintronic applications. While the spin–orbit coupling is known to play a pivotal role in the ultrafast laser‐induced demagnetization, the effect of the anisotropic spin–orbit coupling on the transient magnetization remains an open issue. This study uncovers the role of anisotropic spin–orbit coupling in the spin dynamics in a half‐metallic La 0.7 Sr 0.3 MnO 3 film by ultrafast pump–probe technique. The magnetic order is found to be transiently enhanced or attenuated within the initial sub‐picosecond when the probe light is tuned to be s‐ or p‐polarized, respectively. The subsequent slow demagnetization amplitude follows the fourfold symmetry of thed x 2 − y 2orbitals as a function of the polarization angles of the probe light. A model based on the Elliott–Yafet spin‐flip scatterings is proposed to reveal that the transient magnetization enhancement is related to the spin‐mixed states arising from the anisotropic spin–orbit coupling. The findings provide new insights into the spin dynamics in magnetic systems with anisotropic spin–orbit coupling as well as perspectives for the ultrafast control of information process in spintronic devices.