Critical behavior within 20 fs drives the out-of-equilibrium laser-induced magnetic phase transition in nickel

Tengdin, Phoebe; You, Wenjing; Chen, Cong; Shi, Xun; Zusin, Dmitriy; Zhang, Yingchao; Gentry, Christian; Blonsky, Adam; Keller, Mark W.; Oppeneer, Peter M.; Kapteyn, Henry C.; Tao, Zhensheng; Murnane, Margaret M.

doi:10.1126/sciadv.aap9744

Cited by 135 publications

(151 citation statements)

References 48 publications

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“…As this demagnetization is due to optically induced transitions only, these results may explain the early phase of the demagnetization happening during the pulse through light-induced Stoner excitations. This contribution supplements the others, as, e.g., the ultrafast generation of magnons, whose roles are still heavily debated [19][20][21][22][23][24] in the explanation of ultrafast lightinduced demagnetization. However, unlike other mechanisms where the angular momentum has to be transferred to other baths, such as phonons through Elliott-Yafet scattering [18] or the ultrafast Einstein-de Haas effect [25], these Stoner excitations are directly induced by light and no other dissipation channel is required to allow a spin flip.…”

supporting

confidence: 53%

Ab initio theory of magnetization induced by light absorption in ferromagnets

et al. 2019

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supporting

confidence: 53%

Ab initio theory of magnetization induced by light absorption in ferromagnets

et al. 2019

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“…When we use a π pulse, the correlation function C(l, t) similarly collapses within 20 fs. This nicely explains why experimentally Tengdin et al [34] reported a magnetic phase transition within 20 fs.…”

Section: B Spin-spin Correlation Collapse Within 20 Fssupporting

confidence: 66%

“…Second, we are able to describe these spin waves of wavelength over hundred lattices. Our finding does not only explain the band mirroring effect [33] and ultrafast magnetic phase transition within 20 fs [34], but opens the door to a fresh paradigm for laser-induced ultrafast demagnetization. * guo-ping.zhang@outlook.com…”

Section: Discussionmentioning

confidence: 76%

Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism

Zhang

Murakami

Bai

et al. 2019

Journal of Applied Physics

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Laser-induced femtosecond demagnetization, femtomagnetism, offers a potential route to develop faster magnetic storage devices. It is generally believed that the traditional spin-wave theory, which is developed for thermally driven slow demagnetization, can not explain this rapid demagnetization by design. Here we show that this traditional spin-wave theory, once augmented by laser-induced spin-orbit torque, provides a highly efficient paradigm for demagnetization, by capturing lowenergy spin-wave excitation that is absent in existing mechanisms. Our paradigm is different from existing ones, but does not exclude them. Microscopically, we find that optical spin-orbit torque generates massive spin waves across several hundred lattice sites, collapsing the long-range spin-spin correlation within 20 fs. Our finding does not only explain new experiments, but also establishes an alternative paradigm for femtomagnetism. It is expected to have far-reaching impacts on future research.

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“…The XUV probe's energy range allows core level to valence transitions to be measured, with the photoexcited change in absorption containing both electronic and structural dynamics 7 . The combination of temporal resolution and probed energy range possible with XUV sources has led to new insights into the first few-femtoseconds of photoexcitation, as well as into the longer timescale dynamics of electron-phonon and phonon-phonon scattering [8][9][10][11][12][13][14] . The same is true for x-ray transient absorption studies performed using x-ray free electron lasers and synchrotrons [15][16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Differentiating Photoexcited Carrier and Phonon Dynamics in the Δ, L, and Γ Valleys of Si(100) with Transient Extreme Ultraviolet Spectroscopy

et al. 2019

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Transient extreme ultraviolet (XUV) spectroscopy probes core level transitions to unoccupied valence and conduction band states. Uncertainty remains to what degree the core-hole created by the XUV transition modifies the measurement of photoexcited electron and hole energies. Here, the Si L2,3 edge is measured after photoexcitation of electrons to the Δ, L, and Γ valleys of Si(100). The measured changes in the XUV transition probability do not energetically agree with the increasing electron photoexcitation energy. The data therefore experimentally confirm that, for the Si L2,3 edge, the time-dependent electron and hole energies are partially obscured by the core-hole perturbation. A model based on many-body approximations and the Bethe-Salpeter equation is successfully used to predict the core-hole's modification of the final transition density of states in terms of both electronic and structural dynamics. The resulting fit time constants match the excited state electron thermalization time and the inter-valley electronphonon, intra-valley electron-phonon, and phonon-phonon scattering times previously measured in silicon. The outlined approach is a more comprehensive framework for interpreting transient XUV absorption spectra in photoexcited semiconductors.

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Critical behavior within 20 fs drives the out-of-equilibrium laser-induced magnetic phase transition in nickel

Abstract: High-harmonic spectroscopies reveal that fast energy transfer within 20 fs triggers ultrafast magnetic phase transition in Ni.

Cited by 135 publications

References 48 publications

Ab initio theory of magnetization induced by light absorption in ferromagnets

Ab initio theory of magnetization induced by light absorption in ferromagnets

Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism

Differentiating Photoexcited Carrier and Phonon Dynamics in the Δ, L, and Γ Valleys of Si(100) with Transient Extreme Ultraviolet Spectroscopy

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