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Ultrafast Orbital-Oriented Control of Magnetization in Half-Metallic La0.7Sr0.3MnO3 Films

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Author(s)

  • Bo Liu
  • Wei Niu
  • Yongda Chen
  • Xuezhong Ruan
  • Zhixiong Tang
  • Xuefeng Wang
  • Wenqing Liu
  • Liang He
  • Yao Li
  • Jing Wu
  • Shaolong Tang
  • Jun Du
  • Rong Zhang
  • Yongbing Xu

Department/unit(s)

Publication details

JournalAdvanced Materials
DateAccepted/In press - 1 Jan 2019
DateE-pub ahead of print - 21 Jan 2019
DatePublished (current) - 15 Mar 2019
Issue number11
Volume31
Number of pages6
Early online date21/01/19
Original languageEnglish

Abstract

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 La0.7Sr0.3MnO3 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 the dx2 y2 orbitals 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.

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© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

    Research areas

  • perovskite, spintronics, spin–orbit coupling, ultrafast magnetization, ultrafast spectroscopy

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