The QLA and QTA strain Picosecond opto-acoustic interferometry and polarimetry in high-index GaAs

Scherbakov, A. V.; Bombeck, M.; Jäger, J. V.; Salasyuk, A. S.; Linnik, T. L.; Gusev, Vitalyi; Yakovlev, D. R.; Akimov, A. V.; Bayer, М.

doi:10.1364/oe.21.016473

Cited by 16 publications

(21 citation statements)

References 41 publications

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“…These frequencies are independent of the applied magnetic field and correspond to the quasilongitudinal (QLA) and quasi-transverse (QTA) acoustic modes, respectively, in agreement with our previous observations and analysis [25]. The coherent phonons modify the MCA via inverse magnetostriction [15,22].…”

Section: Theoretical Analysis and Discussionsupporting

confidence: 86%

“…The main difference between (311)-and isotropic or high-symmetry oriented films is the optically-induced excitation of two kinds of strain contributions due to the coupling of the thermal stress to two acoustic waves possessing longitudinal displacement components: QLA and QTA ones [25]. It is convenient to introduce two wave amplitudes To calculate the temperature distribution which determine the thermal stress the two-temperature model is used, which assumes the electrons and the lattice have pseudoequilibrium temperatures…”

Section: Discussionmentioning

confidence: 99%

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Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

et al. 2016

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. (2016) Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films. Physical Review B, 93 (21 A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. ABSTRACTUltrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of non-coherent phonons, which modifies the temperature dependent parameters of the magneto-crystalline anisotropy; and coherent phonons in the form of a strain contributing via inverse magnetostriction. Contrary to the earlier experiments with high symmetry ferromagnetic structures, where these mechanisms could not be separated, we study the magnetization response to femtosecond optical pulses in the low-symmetry magnetostrictive Galfenol film so that it is possible to separate the coherent and non-coherent phonon contributions. By choosing certain experimental geometry and external magnetic field, we can distinguish the contribution from a specific mechanism. Theoretical analysis and numerical calculations are used to support the experimental observations and proposed model.

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Section: Theoretical Analysis and Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

et al. 2016

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“…Significant physical-technical progress also could be expected through 44 the application of shear CAPs for TDBS imaging. Although optoacoustic transducers for shear CAPs are more elaborate than those used for compression/dilatation waves 33,[121][122][123][124][125][126][127][128][129][130][131][132][133] and detection of shear CAPs as well 33,122,133 , their application would provide access to imaging of the complex shear rigidity of inhomogeneous media at nanoscale.…”

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confidence: 99%

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Gusev

Ruello

2018

Applied Physics Reviews

105

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Time-domain Brillouin scattering is an all-optical experimental technique based on ultrafast lasers applied for generation and detection of coherent acoustic pulses on time durations of picoseconds and length scales of nanometers. In transparent materials scattering of the probe laser beam by the coherent phonons permits imaging of sample inhomogeneity. The transient optical reflectivity of the sample recorded by the probe beam as the acoustic nanopulse propagates in space contains information on the acoustical, optical, and acousto-optical parameters of the material under study. The experimental method is based on a heterodyning where weak light pulses scattered by the coherent acoustic phonons interfere at the photodetector with probe light pulses of significantly higher amplitude reflected from various interfaces of the sample. The time-domain Brillouin scattering imaging is based on Brillouin scattering and has the potential to provide all the information that researchers in material science, physics, chemistry, biology etc., get with classic frequency-domain Brillouin scattering of light. It can be viewed as a replacement for Brillouin scattering and Brillouin microscopy in all investigations where nanoscale spatial resolution is either required or advantageous. Here we review applications of time-domain Brillouin scattering for imaging of nanoporous films, ion-implanted semiconductors and dielectrics, texture in polycrystalline materials and inside vegetable and animal cells, and for monitoring the transformation of 2nanosound caused by nonlinearity and focusing. We also discuss the perspectives and the challenges for the future.I.

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“…The corresponding thermal stress leads to the persistent compressive ε zz = 1.2 · 10 −3 and shear ε xz = −4 · 10 −4 strain. 20 With these values we were able to model using Eqs. 2-3 the precession of magnetization excited due to strain-induced magnetic anisotropy change.…”

Section: Resultsmentioning

confidence: 99%

Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films

Kats¹,

Linnik

Salasyuk³

et al. 2016

SPIE Proceedings

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Spin-lattice coupling is one of the most prominent interactions mediating response of spin ensemble to ultrafast optical excitation. Here we exploit optically generated coherent and incoherent phonons to drive coherent spin dynamics, i.e. precession, in thin films of magnetostrictive metal Galfenol. We demonstrate unambiguously that coherent phonons, also seen as dynamical strain generated due to picosecond lattice temperature raise, give raise to magnetic anisotropy changes of the optically excited magnetic film; and this contribution may be comparable to or even dominate over the contribution from the temperature increase itself, considered as incoherent phonons.

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The QLA and QTA strain Picosecond opto-acoustic interferometry and polarimetry in high-index GaAs

Cited by 16 publications

References 41 publications

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films

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