The mechanical properties of a nanocrystalline Al2O3/a-Al2O3 composite coating measured by nanoindentation and Brillouin spectroscopy

FG Ferré, E Bertarelli, A Chiodoni, D Carnelli… - Acta Materialia, 2013‏ - Elsevier
In this work, ellipsometry, Brillouin spectroscopy and nanoindentation are combined to
assess the mechanical properties of a nanocrystalline Al2O3/a-Al2O3 composite coating …

Correlation among hydrogenation, magnetoelastic coupling, magnetic anisotropy, and magnetoresistance in magnetostrictive, hydrogen-absorbing palladium-cobalt …

T Harumoto, Y Nakamura, J Shi - International Journal of Hydrogen Energy, 2021‏ - Elsevier
Hydrogen-absorbing magnetic alloy films, such as palladium-cobalt (PdCo) alloy films, are
expected to play a significant role in the next generation of hydrogen sensors. However …

Elastic constant and Brillouin oscillations in sputtered vitreous thin films

H Ogi, T Shagawa, N Nakamura, M Hirao, H Odaka… - Physical Review B …, 2008‏ - APS
We studied the relationship between elastic constants and microstructure in sputtered
vitreous SiO 2 thin films using pump-probe picosecond laser ultrasound. The delayed probe …

Intrinsic coherent acoustic phonons in the indirect band gap semiconductors Si and GaP

K Ishioka, A Rustagi, U Höfer, H Petek, CJ Stanton - Physical Review B, 2017‏ - APS
We report on the intrinsic optical generation and detection of coherent acoustic phonons at
(001)-oriented bulk Si and GaP without metallic phonon transducer structures …

Picosecond ultrasound spectroscopy for studying elastic modulus of thin films: a review

H Ogi, N Nakamura, M Hirao - Nondestructive testing and …, 2011‏ - Taylor & Francis
This article introduces an advanced acoustic method for measuring the out-of-plane
longitudinal-wave modulus of thin films using picosecond ultrasound. The ultrafast light …

Full characterization of ultrathin 5-nm low- dielectric bilayers: Influence of dopants and surfaces on the mechanical properties

TD Frazer, JL Knobloch, JN Hernández-Charpak… - Physical Review …, 2020‏ - APS
Ultrathin films and multilayers, with controlled thickness down to single atomic layers, are
critical for advanced technologies ranging from nanoelectronics to spintronics to quantum …

[HTML][HTML] Variable repetition frequency asynchronous optical sampling method without a feedback loop

A Nagakubo, K Kanai, H Tamura, A Tange, H Ogi - AIP Advances, 2022‏ - pubs.aip.org
The ultrafast pump–probe measurement represents a key technique to study fs–ps
dynamics. The asynchronous optical sampling (ASOPS) method realizes fast and long time …

Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory

A Nagakubo, HT Lee, H Ogi, T Moriyama… - Applied Physics …, 2020‏ - pubs.aip.org
Tungsten thin films are used for various applications and sometimes exhibit an A15 structure
(β-W). They have some superior properties in comparison to the bcc structure (α-W), such as …

Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire

R Beardsley, AV Akimov, JDG Greener, GW Mudd… - Scientific reports, 2016‏ - nature.com
Van der Waals (vdW) layered crystals and heterostructures have attracted substantial
interest for potential applications in a wide range of emerging technologies. An important …

Collective acoustic modes in various two-dimensional crystals by ultrafast acoustics: Theory and experiment

JF Robillard, A Devos, I Roch-Jeune, PA Mante - Physical Review B …, 2008‏ - APS
We study the elastic properties of two-dimensional phononic crystals made of aluminum
nanocube lattices. From the experimental point of view, collective modes resulting from the …