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- W2000660674 abstract "Electronic Theory of Ultrafast Spin Dynamics in NiONiO is a good candidate for ultrafast magnetic switching because of its large spin density, antiferromagnetic order, and clearly separated intragap states. In order to detect and monitor the switching dynamics, we develop a systematic approach to study optical second harmonic generation (SHG) in NiO, both at the (001) surface and in the bulk. In our calculations NiO is modeled as a doubly embedded cluster. All intragap d-states of the bulk and the (001) surface are obtained with highly-correlational quantum chemistry and propagated in time under the influence of a static magnetic field and a laser pulse. We find that demagnetization and switching can be best achieved in a subpicosecond regime with linearly rather than circularly polarized light. We also show the importance of including an external magnetic field in order to distinguish spin-up and spin-down states and the necessity of including magnetic-dipole transitions in order to realize the process in the centrosymmetric bulk. Having already shown the effects of phonons in the SHG for the bulk NiO within the frozen-phonon approximation, and following the same trail of thoughts, we discuss the role of phonons in a fully quantized picture as a symmetrylowering mechanism in the switching scenario and investigate the electronic and lattice temperature effects." @default.
- W2000660674 created "2016-06-24" @default.
- W2000660674 creator A5061333322 @default.
- W2000660674 date "2014-01-01" @default.
- W2000660674 modified "2023-09-26" @default.
- W2000660674 title "Electronic Theory of Ultrafast Spin Dynamics in NiO" @default.
- W2000660674 doi "https://doi.org/10.4172/2324-8777.1000151" @default.
- W2000660674 hasPublicationYear "2014" @default.
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