Ultrafast Orbital-Oriented Control of Magnetization in Half-Metallic La_0.7Sr_0.3MnO₃ Films

TY - JOUR

T1 - Ultrafast Orbital-Oriented Control of Magnetization in Half-Metallic La0.7Sr0.3MnO3 Films

AU - Liu, Bo

AU - Niu, Wei

AU - Chen, Yongda

AU - Ruan, Xuezhong

AU - Tang, Zhixiong

AU - Wang, Xuefeng

AU - Liu, Wenqing

AU - He, Liang

AU - Li, Yao

AU - Wu, Jing

AU - Tang, Shaolong

AU - Du, Jun

AU - Zhang, Rong

AU - Xu, Yongbing

N1 - © 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.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - 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.

AB - 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.

KW - perovskite

KW - spintronics

KW - spin–orbit coupling

KW - ultrafast magnetization

KW - ultrafast spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85060327281&partnerID=8YFLogxK

U2 - 10.1002/adma.201806443

DO - 10.1002/adma.201806443

M3 - Article

AN - SCOPUS:85060327281

VL - 31

JO - Advanced Materials

JF - Advanced Materials

SN - 0935-9648

IS - 11

M1 - 1806443

ER -