Measurement of transient strain induced by two-photon excitation

Zeuschner, Steffen Peer; Pudell, J.; Reppert, A. von; Deb, Marwan; Popova, E.; Keller, N.; Rössle, Matthias; Herzog, Marc; Bargheer, Matias

doi:10.1103/physrevresearch.2.022013

Cited by 12 publications

(14 citation statements)

References 58 publications

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“…1(d)]. This phonon heat energy density was the main component of the stress that drove the strain [32,48,50]. More importantly, Fig.…”

Section: K [51] a Phonon Heat Conductivity κ Phmentioning

confidence: 93%

“…[32] except that the Cu thickness was 110 nm to match the timings of the coherent strain signals. For Bi-YIG, we used a longitudinal sound velocity V L Bi−YIG = 6300 m/s [49,50], a phonon heat capacity C ph Bi−YIG = 2.9 J/m 3…”

Section: Sample Characterization and Experimental Methodsmentioning

confidence: 99%

“…Bi−YIG = 6 W/mK [51], and a Grüneisen constant s Bi−YIG = 1 [50]. The modeling of the average lattice strain is plotted as solid lines in Figs.…”

Section: K [51] a Phonon Heat Conductivity κ Phmentioning

confidence: 99%

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Generation of spin waves via spin-phonon interaction in a buried dielectric thin film

Deb

Popova²,

Zeuschner³

et al. 2021

Phys. Rev. B

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In this paper, we investigate the magnetic, optical, and lattice responses of a Pt/Cu/Bi 1 Y 2 Fe 5 O 12 /Gd 3 Ga 5 O 12 heterostructure to femtosecond laser excitation of the opaque Pt/Cu metallic bilayer. The electronic excitation generates coherent and incoherent phonons, which trigger high-frequency standing spin waves (SWs) in the dielectric Bi 1 Y 2 Fe 5 O 12 layer via a phonon-induced change of magnetic anisotropy. We find that the incoherent phonons (heat) can induce a fast (<1ps) and slow (>1000 ps) decrease of the magnetic order by different spin-phonon interaction scenarios. These results open perspectives for generating high-frequency SWs in buried magnetic garnets.

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“…1(d)]. This phonon heat energy density was the main component of the stress that drove the strain [32,48,50]. More importantly, Fig.…”

Section: K [51] a Phonon Heat Conductivity κ Phmentioning

confidence: 93%

Section: Sample Characterization and Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Generation of spin waves via spin-phonon interaction in a buried dielectric thin film

Deb

Popova²,

Zeuschner³

et al. 2021

Phys. Rev. B

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“…The signal is limited by the x-ray pulse duration. The time of maximum expansion is given by T = d/v = 17 ps, where d is the thickness of the film and v is the sound velocity of BIG [51]. The long-lived expanded state exhibits very slow relaxation dynamics.…”

mentioning

confidence: 99%

“…The light energy is absorbed in the BIG layer by electronic transitions related to the Fe 3+ ions [46,54,55]. These electronic states are very short lived [51] and rapidly transfer the entire energy to vibrations of the lattice via electron-phonon coupling. This lattice temperature rise associated with this heat energy induces a lattice expansion, which is directly quantified by UXRD measurements.…”

mentioning

confidence: 99%

Ultrafast control of lattice strain via magnetic circular dichroism

et al. 2021

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Using ultrafast x-ray diffraction, we directly monitor the lattice dynamics induced by femtosecond laser pulses in nanoscale thin films of bismuth iron garnet in external magnetic fields H ext . We control the ultrafast laserinduced lattice strain amplitude by changing the laser pulse helicity. The strength of H ext is used as an external parameter to switch the helicity dependence on and off, respectively. Based on magneto-optical spectroscopic measurements, we explain these phenomena by magnetic circular dichroism. Our findings highlight an important approach for ultrafast manipulation of lattice strain in magnetic materials, in particular insulators, and open exciting perspectives towards ultrafast control of lattice strain and heat-induced magnetization switching and spin waves in bismuth substituted iron garnets using the polarization of light.

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4D Visualization of a Nonthermal Coherent Magnon in a Laser Heated Lattice by an X‐ray Free Electron Laser

et al. 2023

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Ultrafast optical manipulation of magnetic phenomena is an exciting achievement of mankind, expanding one's horizon of knowledge toward the functional nonequilibrium states. The dynamics acting on an extremely short timescale push the detection limits that reveal fascinating light–matter interactions for nonthermal creation of effective magnetic fields. While some cases are benchmarked by emergent transient behaviors, otherwise identifying the nonthermal effects remains challenging. Here, a femtosecond time‐resolved resonant magnetic X‐ray diffraction experiment is introduced, which uses an X‐ray free‐electron laser (XFEL) to distinguish between the effective field and the photoinduced thermal effect. It is observed that a multiferroic Y‐type hexaferrite exhibits magnetic Bragg peak intensity oscillations manifesting entangled antiferromagnetic (AFM) and ferromagnetic (FM) Fourier components of a coherent AFM magnon. The magnon trajectory constructed in 3D space and time domains is decisive to evince ultrafast field formation preceding the lattice thermalization. A remarkable impact of photoexcitation across the electronic bandgap is directly unraveled, amplifying the photomagnetic coupling that is one of the highest among AFM dielectrics. Leveraging the above‐bandgap photoexcitation, this energy‐efficient optical process further suggests a novel photomagnetic control of ferroelectricity in multiferroics.

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Measurement of transient strain induced by two-photon excitation

Cited by 12 publications

References 58 publications

Generation of spin waves via spin-phonon interaction in a buried dielectric thin film

Generation of spin waves via spin-phonon interaction in a buried dielectric thin film

Ultrafast control of lattice strain via magnetic circular dichroism

4D Visualization of a Nonthermal Coherent Magnon in a Laser Heated Lattice by an X‐ray Free Electron Laser

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