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Nanolayer-Confined
Strain Waves in Femtosecond-Optical-Vortex-Excited
Multiferroic BiFeO<sub>3</sub>
Sung Yun Lee (6902663)
Seong Gook Kim (25089267)
Heung-Sik Park (12010155)
Jihun Kim (10091)
Jungchan Choi (25089270)
Sinwoo Kim (19429671)
Eunyoung Park (3369215)
Seung-Phil Heo (14550924)
Seongbin Oh (9090809)
Junha Hwang (3564854)
Myong-jin Kim (25089273)
Minhyun Kim (19145162)
Do Geun Jang (25089276)
Hyunjung Kim (135950)
Daewoong Nam (1816297)
Sangsoo Kim (2998)
Hyon Chol Kang (1594837)
Chan-Ho Yang (4729110)
Changyong Song (1816300)
Biophysics
Physical Sciences not elsewhere classified
Medicine
Microbiology
Biotechnology
Evolutionary Biology
Ecology
transient strain fields
transient angular shifts
strain waves provide
revealing acoustic modes
resolution imaging beyond
reshape nanoscale order
reflection images track
longitudinal sound velocity
lattice deformation couples
excited strain dynamics
excited multiferroic bifeo
element simulations attribute
connecting acoustic excitation
confined strain waves
compressive strain waves
buried functional nanolayers
pc </ sub
3 </ sub
001 ]< sub
001 )< sub
10 ± 0
functional materials
yet progress
work establishes
temperature finite
spin degrees
space tracking
resolved dark
ray microscopy
overlapping tensile
layer embedded
field x
crystallographic selectivity
5 ghz
18 km
Strain waves provide a route to reshape nanoscale order
in functional
materials, where lattice deformation couples to charge and spin degrees
of freedom. Real-space tracking of these transient strain fields is
critical for connecting acoustic excitation to functionality, yet
progress has been limited because buried crystalline layers require
simultaneous spatial, temporal, and crystallographic selectivity for
high-resolution imaging beyond the surface. Here, we reveal optical-vortex-excited
strain dynamics in a 100 nm thick BiFeO<sub>3</sub> layer embedded
in an oxide heterostructure using time-resolved dark-field X-ray microscopy.
An infrared optical vortex launches strain waves, and (001)<sub>PC</sub> Bragg-reflection images track the [001]<sub>PC</sub>-projected lattice
deformation, revealing acoustic modes at 15.7, 21.0, and 35.5 GHz
and a longitudinal sound velocity of 4.10 ± 0.18 km s<sup>–1</sup>. Two-temperature finite-element simulations attribute the transient
angular shifts to overlapping tensile and compressive strain waves.
This work establishes a route to visualize confined picosecond strain
fields in buried functional nanolayers.
2026-09-22T00:00:00Z
Dataset
Media
10.1021/acs.nanolett.6c03252.s003
https://figshare.com/articles/media/Nanolayer-Confined_Strain_Waves_in_Femtosecond-Optical-Vortex-Excited_Multiferroic_BiFeO_sub_3_sub_/33963993
CC BY-NC 4.0