Ultrafast photoinduced mechanical strain in epitaxial BiFeO<sub>3</sub> thin films

Chen, L. Y.; Yang, Jinn-Moon; Luo, Chih-Wei; Laing, Carson; Wu, Kaung‐Hsiung; Lin, Jiunn‐Yuan; Uen, T. M.; Juang, Jenh‐Yih; Chu, Ying Hao; Kobayashi, Toshio

doi:10.1063/1.4734512

Cited by 50 publications

(50 citation statements)

References 26 publications

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“…Similar ultrafast reflectivity transients (with a rapid rise and a non-exponential decay) have been reported in recent studies of bulk BFO4950 and thin films grown on a variety of substrates375152. The rapid rise in reflectivity after excitation is attributed to the transfer of electrons between states.…”

Section: Discussionsupporting

confidence: 82%

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Doig

Peters

Nawaz

et al. 2015

Sci Rep

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Bulk crystals and thin films of PbTi1−xFexO3−δ (PTFO) are multiferroic, exhibiting ferroelectricity and ferromagnetism at room temperature. Here we report that the Ruddlesden-Popper phase Pbn+1(Ti1−xFex)nO3n+1−δ forms spontaneously during pulsed laser deposition of PTFO on LaAlO3 substrates. High-resolution transmission electron microscopy, x-ray diffraction and x-ray photoemission spectroscopy were utilised to perform a structural and compositional analysis, demonstrating that and . The complex dielectric function of the films was determined from far-infrared to ultraviolet energies using a combination of terahertz time-domain spectroscopy, Fourier transform spectroscopy, and spectroscopic ellipsometry. The simultaneous Raman and infrared activity of phonon modes and the observation of second harmonic generation establishes a non-centrosymmetric point group for Pbn+1(Ti0.5Fe0.5)nO3n+1−δ, a prerequisite for (but not proof of) ferroelectricity. No evidence of macroscopic ferromagnetism was found in SQUID magnetometry. The ultrafast optical response exhibited coherent magnon oscillations compatible with local magnetic order, and additionally was used to study photocarrier cooling on picosecond timescales. An optical gap smaller than that of BiFeO3 and long photocarrier lifetimes may make this system interesting as a ferroelectric photovoltaic.

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Section: Discussionsupporting

confidence: 82%

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Doig

Peters

Nawaz

et al. 2015

Sci Rep

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“…Time-resolved reflectivity has been used previously to determine the elastic constants of bulk single-crystal BFO and bulk-like BiFeO 3 on SrTiO 3 along [101]-oriented crystals (rhombohedral [010] direction), 27,29 and these results are also included in Table I. Conventional ultrasound measurements yielded 127 GPa for polycrystalline BFO, 41 substantially lower because of averaging over all crystallographic directions.…”

Section: Resultsmentioning

confidence: 99%

“…Since the reflectivity of a sample at normal incidence is R = |( n − 1)/( n + 1)| 2 , the photoinduced change R will be proportional to the change in the refractive index. Oscillations in R can therefore arise from periodic changes to the refractive index, as created by acoustic phonon modes in BFO 27,29 and LuMnO 3 . 31,32 Alternatively, since n = √ μ (where and μ are the dielectric function and permeability, respectively), magnon modes can modulate R, as reported 9 for the hexaferrite Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 .…”

Section: Time-resolved Reflectivitymentioning

confidence: 99%

Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3multiferroic thin films

et al. 2013

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Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi 1−x−y Dy x La y FeO 3 using femtosecond laser pulses. The elastic moduli of rhombohedral, tetragonal, and rare-earth doped BiFeO 3 were determined from acoustic-mode frequencies in conjunction with spectroscopic ellipsometry. A weak ferromagnetic order, induced alternately by magnetization in the growth direction or by tetragonality, created a magnon oscillation at 75 GHz, indicative of a Dzyaloshinskii-Moriya interaction energy of 0.31 meV.

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“…23 In this respect, the report on the fast (below 100 ls) photostriction in a single crystal of BiFeO 3 has recently attracted an attention from the optical scientific community. [39][40][41][42][43] Because photostriction depends on the light penetration depth, its response time and a magnitude can still be improved in thin films. Indeed, the photostriction response in BFO films was reported to be in the picoseconds range.…”

Section: The Bifeo 3 Single Crystals and Filmsmentioning

confidence: 99%

Photostrictive materials

Kundys

2015

Applied Physics Reviews

135

131

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Light-matter interactions that lead to nonthermal changes in size of the sample constitute a photostrictive effect in many compounds. The photostriction phenomenon was observed in four main groups of materials, ferroelectrics, polar, and non-polar semiconductors, as well as in organic-based materials that are reviewed here. The key mechanisms of photostriction and its dependence on several parameters and perturbations are assessed. The major literature of the photostriction is surveyed, and the review ends with a summary of the proposed technical applications.Comment: Photostriction review, Photostrictive materials are summarized, Photostrictive efficiency is described, 13 page

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Ultrafast photoinduced mechanical strain in epitaxial BiFeO₃ thin films

Cited by 50 publications

References 26 publications

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3multiferroic thin films

Photostrictive materials

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Ultrafast photoinduced mechanical strain in epitaxial BiFeO3 thin films

Cited by 50 publications

References 26 publications

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3multiferroic thin films

Photostrictive materials

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Ultrafast photoinduced mechanical strain in epitaxial BiFeO₃ thin films