Light-wave dynamic control of magnetism

Siegrist, Florian; Gessner, Julia Anthea; Ossiander, Marcus; Denker, Christian; Chang, Yi–Ping; Schröder, Malte; Guggenmos, Alexander; Cui, Yang; Walowski, Jakob; Martens, Ulrike; Dewhurst, J. K.; Kleineberg, Ulf; Münzenberg, Markus; Sharma, S.; Schultze, Martin

doi:10.1038/s41586-019-1333-x

Cited by 276 publications

(281 citation statements)

References 37 publications

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“…We believe that our findings are of a very general nature and can be extended to a variety of magnetic heterostructures. Last, as an immediate consequence of the results obtained in this work, we forecast a control of the spin dynamics on the attosecond time scale, and note that a first light-wave dynamic control of magnetization has indeed recently been identified (55). This not only will allow us to explore the fundamental limits of material science and magnetism to ever smaller length and ever faster time scales, but will also have intriguing consequences for future information technology application.…”

Section: Discussionsupporting

confidence: 58%

Ultrafast optically induced spin transfer in ferromagnetic alloys

et al. 2020

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The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all-optical manipulation requires control schemes for which the electronic or magnetic subsystems of the materials are coherently manipulated on the time scale of the laser excitation pulse. In our work, we provide experimental evidence of such a direct, ultrafast, and coherent spin transfer between two magnetic subsystems of an alloy of Fe and Ni. Our experimental findings are fully supported by time-dependent density functional theory simulations and, hence, suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.

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Section: Discussionsupporting

confidence: 58%

Ultrafast optically induced spin transfer in ferromagnetic alloys

et al. 2020

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“…The recent development of spectroscopic techniques based on attosecond extreme-ultraviolet (XUV) pulses has given us the ability to follow the ultrafast electron motion in solids that underlies fundamental processes of lightmatter interaction. Besides photoelectron spectroscopy [1][2][3][4], all-optical techniques like attosecond transient absorption spectroscopy (ATAS) [5] have shown their potential for the investigation of fundamental phenomena in semiconductors [6], dielectrics [7], metals [8] and magnetic systems [9], up to petahertz driving fields [10]. The first pioneering experiments brought unprecedented insights in strong-field physics in solid systems, addressing the role of inter-and intra-band excitation from a new perspective [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Attosecond timing of the dynamical Franz–Keldysh effect

Lucchini¹,

Sato²,

Schlaepfer³

et al. 2020

J. Phys. Photonics

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To what extent do intra-or inter-band transitions dominate the optical response of dielectrics when pumped by a few-cycle near-infrared transient electric field? In order to find an answer to this question we investigate the dynamical Franz-Keldysh effect in polycrystalline diamond and discuss in detail the attosecond delay of the induced electron dynamics with regard to the driving transient electric field while the peak intensity is varied between 1 × 10 12 and 10×10 12 W cm −2 . We found that the main oscillating feature in transient absorption at 43 eV is in phase with the electric field of the pump, to within 49 ±78 as. However, the phase delay shows a slightly asymmetric V-shaped linear energy dispersion with a rate of about 200 as eV -1 . Theoretical calculations within the dipole approximation reproduce the data and allow us to conclude that intra-band motion dominates under our experimental conditions.

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“…This can be clearly seen for the Co peak at 60 eV where Pt O 23 -edges contributes significantly and for the Pt O 23 -edge where transitions from Co states contribute significantly. This raises the question of whether the dynamics as traced by the intensity of the peak at 60 eV and 54 eV can corresponds to the dynamics of the Co and Pt local moment respectively, as is generally assumed to be the case [15,[29][30][31][32][33][34].…”

mentioning

confidence: 99%

“…In the case of CoPt the dynamics is the results of two processes acting in tandem: (i) OISTR which causes the minority spins to transfer from the Pt to Co (as observed in Refs. [15,16]) and (ii) spin-orbit mediated spin-flips [8,12,[35][36][37] which causes the Pt majority spins to flip into Pt as well as Co minority states leading to a further decrease in the local moment.…”

mentioning

confidence: 99%

Element Specificity of Transient Extreme Ultraviolet Magnetic Dichroism

Dewhurst¹,

Willems²,

Elliott³

et al. 2020

Phys. Rev. Lett.

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In this work we combine theory and experiment to study transient magnetic circular dichroism (tr-MCD) in the extreme ultraviolet spectral range (XUV) in bulk Co and CoPt. We use the abinitio method of real-time time-dependent density functional theory (RT-TDDFT) to simulate the magnetization dynamics in the presence of ultrafast laser pulses. From this we demonstrate how tr-MCD may be calculated using an approximation to the excited-state linear-response. We apply this approximation to Co and CoPt and show computationally that element-specific dynamics of the local spin moments can be extracted from the tr-MCD in XUV energy range, as is commonly assumed. We then compare our theoretical prediction for the tr-MCD for CoPt with experimental measurement and find excellent agreement at many different frequencies including the M23-edge of Co and N67-and O23-edges of Pt. arXiv:1909.00199v1 [cond-mat.mtrl-sci]

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Light-wave dynamic control of magnetism

Cited by 276 publications

References 37 publications

Ultrafast optically induced spin transfer in ferromagnetic alloys

Ultrafast optically induced spin transfer in ferromagnetic alloys

Attosecond timing of the dynamical Franz–Keldysh effect

Element Specificity of Transient Extreme Ultraviolet Magnetic Dichroism

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