First-principles and model simulation of all-optical spin reversal
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TLDR
In this paper, the authors carried out a massively parallel first-principles and model calculation for 13 spin systems and magnetic layers, free of any effective field, to establish a simpler and alternative paradigm of laser-induced ultrafast spin reversal and to point out a path to a full-integrated photospintronic device.Abstract:
All-optical spin switching is a potential trailblazer for information storage and communication at an unprecedented fast rate free of magnetic fields. However, the current wisdom is largely based on semiempirical models of effective magnetic fields and heat pulses, so it is difficult to provide high-speed design protocols for actual devices. Here, we carry out a massively parallel first-principles and model calculation for 13 spin systems and magnetic layers, free of any effective field, to establish a simpler and alternative paradigm of laser-induced ultrafast spin reversal and to point out a path to a full-integrated photospintronic device. It is the interplay of the optical selection rule and sublattice spin orderings that underlines seemingly irreconcilable helicity-dependent and -independent switchings. Using realistic experimental parameters, we predict that strong ferrimagnets, in particular, Laves phase C15 rare-earth alloys, meet the telecommunication energy requirement of 10 fJ, thus allowing a cost-effective subpicosecond laser to switch spin in the gigahertz region.read more
Citations
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Roles of heating and helicity in ultrafast all-optical magnetization switching in TbFeCo
Xianyang Lu,Xianyang Lu,Xiao Zou,Denise Hinzke,Tao Liu,Yichuan Wang,Yichuan Wang,Tuyuan Cheng,Jing Wu,Jing Wu,Thomas Ostler,Thomas Ostler,Jianwang Cai,Ulrich Nowak,Roy W. Chantrell,Ya Zhai,Ya Zhai,Yongbing Xu,Yongbing Xu +18 more
TL;DR: Using the time-resolved magneto-optical Kerr effect method, helicity-dependent alloptical magnetization switching (HD-AOS) was observed in ferrimagnetic TbFeCo films.
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Understanding all-optical spin switching: Comparison between experiment and theory
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Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism
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References
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TL;DR: Numerically and experimentally a novel mechanism of deterministic magnetization reversal in a ferrimagnet driven by an ultrafast heating of the medium resulting from the absorption of a sub-picosecond laser pulse without the presence of a magnetic field is shown.
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All-optical control of ferromagnetic thin films and nanostructures
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