Light-Induced Metastable Magnetic Texture Uncovered by<i>in situ</i>Lorentz Microscopy

Eggebrecht, Tim; Möller, Marcel; Gatzmann, J. Gregor; Silva, Nara Rubiano da; Feist, Armin; Martens, Ulrike; Ulrichs, Henning; Münzenberg, Markus; Ropers, Claus; Schäfer, Sascha

doi:10.1103/physrevlett.118.097203

Cited by 65 publications

(56 citation statements)

References 60 publications

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“…on scales down to few hundreds of nanometers were obtained by various stimuli such as electrical current and light [1][2][3][4][5][6][7][8][9][10] . Optical control of magnetization is particularly appealing due to the absence of an applied external field and the possibility for ultrafast switching speeds.…”

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confidence: 99%

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

et al. 2018

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Novel time-resolved imaging techniques for the investigation of ultrafast nanoscale magnetization dynamics are indispensable for further developments in lightcontrolled magnetism. Here, we introduce femtosecond Lorentz microscopy, achieving a spatial resolution below 100 nm and a temporal resolution of 700 fs, which gives access to the transiently excited state of the spin system on femtosecond timescales and its subsequent relaxation dynamics. We demonstrate the capabilities of this technique by spatio-temporally mapping the light-induced demagnetization of a single magnetic vortex structure and quantitatively extracting the evolution of the magnetization field after optical excitation. Tunable electron imaging conditions allow for an optimization of spatial resolution or field sensitivity, enabling future investigations of ultrafast internal dynamics of magnetic topological defects on 10-nanometer length scales.Aiming for higher bit densities, manipulation of magnetization on the nanoscale is a key aspect for future information processing and storage applications. In recent years, significant achievements on controlling magnetic domains and topological defects †

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confidence: 99%

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

et al. 2018

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“…Magnetism gives rise to an incredibly rich set of nanoscale phenomena, including topological textures such as skyrmions [1][2][3] and vortices [4]. Dynamical control of spin structures down to sub-picosecond timescales is facilitated by a multitude of interactions involving spin-torques [5][6][7] or optical excitations [8][9][10][11]. These features have shown immediate relevance in novel applications, exemplified in (skyrmion) racetrack memory [12,13], magnetic random access memory [14], and vortex oscillators as radio-frequency sources [15,16] or for neuromorphic computing [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Transmission electron microscopy (TEM) facilitates quantitative magnetic imaging with very high spatial resolution approaching the atomic level using aberration-corrected instruments [24,25] and holographic approaches [26][27][28][29], while also allowing for structural or chemical analysis. Importantly, the versatile in-situ environment of TEM enables the observation of nanoscale magnetic changes with optical [11,30,31] or electrical stimuli [32][33][34]. Time-resolved transmission electron microscopy [35][36][37] has in some instances been used to address magnetization dynamics [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Few-nm tracking of current-driven magnetic vortex orbits using ultrafast Lorentz microscopy

et al. 2020

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Transmission electron microscopy is one of the most powerful techniques to characterize nanoscale magnetic structures. In light of the importance of fast control schemes of magnetic states, time-resolved microscopy techniques are highly sought after in fundamental and applied research. Here, we implement time-resolved Lorentz imaging in combination with synchronous radio-frequency excitation using an ultrafast transmission electron microscope. As a model system, we examine the current-driven gyration of a vortex core in a 2 µm-sized magnetic nanoisland. We record the trajectory of the vortex core for continuous-wave excitation, achieving a localization precision of ±2 nm with few-minute integration times. Furthermore, by tracking the core position after rapidly switching off the current, we find a temporal hardening of the free oscillation frequency and an increasing orbital decay rate attributed to local disorder in the vortex potential. arXiv:1907.04608v1 [cond-mat.mes-hall]

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“…In the single-pulse writing experiments, the phase diagram after the excitation results changed into the cooling phase diagram, see Fig. 4a red arrow, following an evolution similar to supercooling 39,40 . The sudden quench of thermal fluctuations (~K/μs) that takes place after the initial temperature jump freezes skyrmions in regions of the phase diagram where they were not present before the arrival of the laser pulse.…”

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Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscope

et al. 2018

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We demonstrate that light-induced heat pulses of different duration and energy can write Skyrmions in a broad range of temperatures and magnetic field in FeGe. Using a combination of camera-rate and pump-probe cryo-Lorentz transmission electron microscopy, we directly resolve the spatiotemporal evolution of the magnetization ensuing optical excitation. The Skyrmion lattice was found to maintain its structural properties during the laser-induced demagnetization, and its recovery to the initial state happened in the sub-μs to μs range, depending on the cooling rate of the system.

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Light-Induced Metastable Magnetic Texture Uncovered byin situLorentz Microscopy

Cited by 65 publications

References 60 publications

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

Few-nm tracking of current-driven magnetic vortex orbits using ultrafast Lorentz microscopy

Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscope

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