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

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 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.

Role of non-thermal electrons in ultrafast spin dynamics of ferromagnetic multilayer

“…www.nature.com/scientificreports www.nature.com/scientificreports/ mechanisms involved with Elliot-Yafet scattering 10,[41][42][43] and spin current 6,7,11,44 have been discussed. Very recently, a quantitative study and comparison between fluence-dependent experiments and a model that includes non-equilibrium effects microscopically has been reported 45 .…”

Organic Chiral Spin‐Optics: The Interaction between Spin and Photon in Organic Chiral Materials

“…Behind the phenomena, the mechanism of magneto-optic coupling is the interaction between spin and photon. [14] It contains two possible channels: one is direct spin-photon interaction; the other one is indirect spin-photon interaction.…”

Separated Electron–Phonon and Phonon–Phonon Scatterings Across Interface in Thin Film LaCoO3/SrTiO3

“…[7] Needless to say, understanding the EPC is also important for such nonsuperconducting oxides to reveal their underlying microscopic mechanisms. [8,9] Transition-metal perovskite LaCoO 3 exhibits a diamagnetic insulating low-spin phase (t 6 2g e 0 g , S = 0) at low temperatures, whereas it becomes metallic at higher temperature with the Co ions assuming a higher spin state (t 4 2g e 2 g , S = 2 or t 5 2g e 1 g , S = 1). [10][11][12][13][14] Recently, it was found that epitaxial tensile-strained LaCoO 3 thin films become ferromagnetic below 85 K, [15][16][17][18] exhibiting application potentials in magnetic devices.…”

“…[ 7 ] Needless to say, understanding the EPC is also important for such non‐superconducting oxides to reveal their underlying microscopic mechanisms. [ 8 , 9 ]…”