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- W2396138353 abstract "The conventional approach of switching the magnetization via fast magnetic field pulses is limited by the rise time of the magnetic field pulses and the periods of induced magnetization precession. However, it has been demonstrated that the magnetization can be reversed by a femtosecond circularly polarized laser pulse without applied magnetic field. This all-optical helicity dependent switch (AO-HDS) brings out an intriguing question on this magnetic process involved during and after the induced field pulse. Here, we present a sub-picosecond time domain study of the magnetization switching induced by circularly polarized femtosecond laser pulses in magnetically hard TbFeCo films. The electron temperature reaches its maximum at 70 fs time delay and the magnetic order is largely quenched by 160 fs. The all-optically induced magnetization switching is triggered within 240 fs and a new magnetization direction is defined in 460 fs, the fastest magnetic writing event ever observed, achieving a new regime of the magnetization reversal time scale for spin based technologies. It is the first trial to define the integral evolution of this ultrafast switch phenomenon using time-resolved magneto-optical Kerr (TR-MOKE) method. The low compensation temperature TMcomp of TbFeCo diminishes the imperative that the TMcomp is supposed to be around or above room temperature for AO-HDS. Atomistic simulations based on a single macro-spin model have been carried out to verify the experimental observations." @default.
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- W2396138353 date "2016-05-24" @default.
- W2396138353 modified "2023-09-26" @default.
- W2396138353 title "Evolution of Helicity-dependent All-Optical Magnetic Switching in TbFeCo Thin Films" @default.
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