Ultrafast electron microscopy for probing magnetic dynamics
Tyler R. Harvey,Tyler R. Harvey,Nara Rubiano da Silva,Nara Rubiano da Silva,John H. Gaida,John H. Gaida,Marcel Möller,Marcel Möller,Armin Feist,Armin Feist,Sascha Schäfer,Claus Ropers,Claus Ropers +12 more
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TLDR
In this article, the authors review the range of physical interactions that produce ultrafast magnetic contrast with electrons, and specifically highlight the recent emergence of ultrafast Lorentz transmission electron microscopy.Abstract:
The spatial features of ultrafast changes in magnetic textures carry detailed information on microscopic couplings and energy transport mechanisms. Electrons excel in imaging such picosecond or shorter processes at nanometer length scales. We review the range of physical interactions that produce ultrafast magnetic contrast with electrons, and specifically highlight the recent emergence of ultrafast Lorentz transmission electron microscopy. From the fundamental processes involved in demagnetization at extremely short timescales to skyrmion-based devices, we show that ultrafast electron imaging will be a vital tool in solving pressing problems in magnetism and magnetic materials where nanoscale inhomogeneity, microscopic field measurement, non-equilibrium behavior or dynamics are involved.read more
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References
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Real-space observation of a two-dimensional skyrmion crystal
X. Z. Yu,Yoshinori Onose,Naoya Kanazawa,Jin-Hong Park,Jung Hoon Han,Yoshio Matsui,Naoto Nagaosa,Yoshinori Tokura +7 more
TL;DR: Real-space imaging of a two-dimensional skyrmion lattice in a thin film of Fe0.5Co 0.5Si using Lorentz transmission electron microscopy reveals a controlled nanometre-scale spin topology, which may be useful in observing unconventional magneto-transport effects.
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Ultrafast spin dynamics in ferromagnetic nickel.
TL;DR: The relaxation processes of electrons and spins systems following the absorption of femtosecondoptical pulses in ferromagnetic nickel have been studied using optical and magneto-optical pump-probetechniques and the experimental results are adequately described by a model including three interacting reservoirs.
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All-optical magnetic recording with circularly polarized light.
C.D. Stanciu,Fredrik Hansteen,Alexey Kimel,Andrei Kirilyuk,Arata Tsukamoto,Akiyoshi Itoh,Theo Rasing +6 more
TL;DR: It is experimentally demonstrate that the magnetization can be reversed in a reproducible manner by a single 40 femtosecond circularly polarized laser pulse, without any applied magnetic field, revealing an ultrafast and efficient pathway for writing magnetic bits at record-breaking speeds.
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Room-temperature chiral magnetic skyrmions in ultrathin magnetic nanostructures
Olivier Boulle,Olivier Boulle,Jan Vogel,Jan Vogel,Hongxin Yang,Hongxin Yang,Stefania Pizzini,Stefania Pizzini,Dayane de Souza Chaves,Dayane de Souza Chaves,Andrea Locatelli,Tevfik Onur Menteş,Alessandro Sala,Liliana D. Buda-Prejbeanu,Liliana D. Buda-Prejbeanu,Olivier Klein,Olivier Klein,Mohamed Belmeguenai,Yves Roussigné,Andrey Stashkevich,S. M. Chérif,Lucia Aballe,Michael Foerster,Mairbek Chshiev,Mairbek Chshiev,Stéphane Auffret,Stéphane Auffret,Ioan Mihai Miron,Ioan Mihai Miron,Gilles Gaudin,Gilles Gaudin +30 more
TL;DR: This work reports on the observation of stable skyrmions in sputtered ultrathin Pt/Co/MgO nanostructures at room temperature and zero external magnetic field, substantiated by micromagnetic simulations and numerical models.
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A strategy for the design of skyrmion racetrack memories
Riccardo Tomasello,Eduardo Martínez,Roberto Zivieri,Luis E. F. Foa Torres,Mario Carpentieri,Giovanni Finocchio +5 more
TL;DR: It is found that the Néel skyrmion moved by the spin-Hall effect is a very promising strategy for technological implementation of the next generation of skyrMion racetrack memories (zero field, high thermal stability, and ultra-dense storage).